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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.00669">arXiv:2410.00669</a> <span> [<a href="https://arxiv.org/pdf/2410.00669">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Development of the normalization method for the first large field-of-view plastic-based PET Modular scanner </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Coussat%2C+A">A. Coussat</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=Baran%2C+J">J. Baran</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">S. Parzych</a>, <a href="/search/physics?searchtype=author&query=Beyene%2C+E">E. Beyene</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Eliyan%2C+K+V">K. V. Eliyan</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Kubat%2C+K">K. Kubat</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">D. Kumar</a>, <a href="/search/physics?searchtype=author&query=Vendan%2C+A+K">A. Kunimal Vendan</a>, <a href="/search/physics?searchtype=author&query=Lisowski%2C+E">E. Lisowski</a>, <a href="/search/physics?searchtype=author&query=Lisowski%2C+F">F. Lisowski</a>, <a href="/search/physics?searchtype=author&query=M%C4%99drala-Sowa%2C+J">J. M臋drala-Sowa</a>, <a href="/search/physics?searchtype=author&query=Moyo%2C+S">S. Moyo</a>, <a href="/search/physics?searchtype=author&query=Mryka%2C+W">W. Mryka</a> , et al. (12 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.00669v1-abstract-short" style="display: inline;"> In positron emission tomography acquisition (PET), sensitivity along a line of response can vary due to crystal geometrical arrangements in the scanner and/or detector inefficiencies, leading to severe artefacts in the reconstructed image. To mitigate these effects, data must be corrected by a set of normalization coefficients applied to each line of response. The J-PET Modular scanner is a PET de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.00669v1-abstract-full').style.display = 'inline'; document.getElementById('2410.00669v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.00669v1-abstract-full" style="display: none;"> In positron emission tomography acquisition (PET), sensitivity along a line of response can vary due to crystal geometrical arrangements in the scanner and/or detector inefficiencies, leading to severe artefacts in the reconstructed image. To mitigate these effects, data must be corrected by a set of normalization coefficients applied to each line of response. The J-PET Modular scanner is a PET device made of 50 cm long plastic strips arranged axially, currently in operation at the Jagiellonian University in Krak贸w (Poland). We have implemented a normalization method for the large field-of-view plastic-based J-PET Modular scanner using the component-based approach. We estimated the geometric normalization factors for the J-PET Modular scanner using Monte Carlo simulations. We also analysed the effects of variations in detection efficiency. A dedicated cylindrical phantom was simulated to investigate the impact of various factors on image quality. The image quality was quantified in terms of radial and axial uniformity metrics, and the standard deviation to mean intensity ratio, determined for a set of image slices. Without normalization, reconstructions of a uniform cylinder exhibit artefacts. These artefacts were satisfactorily compensated using the normalization factors. Applying geometrical corrections lowers the non-uniformity of the image expressed as a standard deviation-to-mean ratio to a range between 5.5 % to 8.5 %. Computationally, the technique is straightforward to parallelize, making it time-efficient. Preliminary estimates suggest that the method is appropriate for use with long axial field-of-view scanners, such as the total-body J-PET, currently under development at the Jagiellonian University. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.00669v1-abstract-full').style.display = 'none'; document.getElementById('2410.00669v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">36 pages, 16 figures, 4 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.07963">arXiv:2409.07963</a> <span> [<a href="https://arxiv.org/pdf/2409.07963">pdf</a>, <a href="https://arxiv.org/format/2409.07963">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Nanoporosity imaging by positronium lifetime tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Beyene%2C+E">E. Beyene</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Kubat%2C+K">K. Kubat</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">D. Kumar</a>, <a href="/search/physics?searchtype=author&query=Lisowski%2C+E">E. Lisowski</a>, <a href="/search/physics?searchtype=author&query=Lisowski%2C+F">F. Lisowski</a>, <a href="/search/physics?searchtype=author&query=M%C4%99drala-Sowa%2C+J">J. M臋drala-Sowa</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">S. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pandey%2C+P">P. Pandey</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">S. Parzych</a>, <a href="/search/physics?searchtype=author&query=del+Rio%2C+E+P">E. Perez del Rio</a>, <a href="/search/physics?searchtype=author&query=R%C3%A4dler%2C+M">M. R盲dler</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Skurzok%2C+M">M. Skurzok</a>, <a href="/search/physics?searchtype=author&query=Tayefi%2C+K">K. Tayefi</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.07963v1-abstract-short" style="display: inline;"> Positron Annihilation Lifetime Spectroscopy (PALS) is a well-established non-destructive technique used for nanostructural characterization of porous materials. It is based on the annihilation of a positron and an electron. Mean positron lifetime in the material depends on the free voids size and molecular environment, allowing the study of porosity and structural transitions in the nanometer scal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.07963v1-abstract-full').style.display = 'inline'; document.getElementById('2409.07963v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.07963v1-abstract-full" style="display: none;"> Positron Annihilation Lifetime Spectroscopy (PALS) is a well-established non-destructive technique used for nanostructural characterization of porous materials. It is based on the annihilation of a positron and an electron. Mean positron lifetime in the material depends on the free voids size and molecular environment, allowing the study of porosity and structural transitions in the nanometer scale. We have developed a novel method enabling spatially resolved PALS, thus providing tomography of nanostructural characterization of an extended object. Correlating space (position) and structural (lifetime) information brings new insight in materials studies, especially in the characterization of the purity and pore distribution. For the first time, a porosity image using stationary positron sources for the simultaneous measurement of the porous polymers XAD4, silica aerogel powder IC3100, and polyvinyl toluene scintillator PVT by the J-PET tomograph is demonstrated <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.07963v1-abstract-full').style.display = 'none'; document.getElementById('2409.07963v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.00574">arXiv:2408.00574</a> <span> [<a href="https://arxiv.org/pdf/2408.00574">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Investigation of Novel Preclinical Total Body PET Designed With J-PET Technology:A Simulation Study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">S. Parzych</a>, <a href="/search/physics?searchtype=author&query=Ardebili%2C+F+T">F. Tayefi Ardebili</a>, <a href="/search/physics?searchtype=author&query=Baran%2C+J">J. Baran</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Eliyan%2C+K">K. Eliyan</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Konieczka%2C+P">P. Konieczka</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">D. Kumar</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">S. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Panek%2C+D">D. Panek</a>, <a href="/search/physics?searchtype=author&query=del+Rio%2C+E+P">E. Perez del Rio</a>, <a href="/search/physics?searchtype=author&query=Raczynski%2C+L">L. Raczynski</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Shivani"> Shivani</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.00574v2-abstract-short" style="display: inline;"> The growing interest in human-grade total body positron emission tomography (PET) systems has also application in small animal research. Due to the existing limitations in human-based studies involving drug development and novel treatment monitoring, animal-based research became a necessary step for testing and protocol preparation. In this simulation-based study two unconventional, cost-effective… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.00574v2-abstract-full').style.display = 'inline'; document.getElementById('2408.00574v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.00574v2-abstract-full" style="display: none;"> The growing interest in human-grade total body positron emission tomography (PET) systems has also application in small animal research. Due to the existing limitations in human-based studies involving drug development and novel treatment monitoring, animal-based research became a necessary step for testing and protocol preparation. In this simulation-based study two unconventional, cost-effective small animal total body PET scanners (for mouse and rat studies) have been investigated in order to inspect their feasibility for preclinical research. They were designed with the novel technology explored by the Jagiellonian-PET (J-PET) Collaboration. Two main PET characteristics: sensitivity and spatial resolution were mainly inspected to evaluate their performance. Moreover, the impact of the scintillator dimension and time-of-flight on the latter parameter was examined in order to design the most efficient tomographs. The presented results show that for mouse TB J-PET the achievable system sensitivity is equal to 2.35% and volumetric spatial resolution to 9.46 +- 0.54 mm3, while for rat TB J-PET they are equal to 2.6% and 14.11 +- 0.80 mm3, respectively. Furthermore, it was shown that the designed tomographs are almost parallax-free systems, hence, they resolve the problem of the acceptance criterion tradeoff between enhancing spatial resolution and reducing sensitivity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.00574v2-abstract-full').style.display = 'none'; document.getElementById('2408.00574v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.08574">arXiv:2407.08574</a> <span> [<a href="https://arxiv.org/pdf/2407.08574">pdf</a>, <a href="https://arxiv.org/format/2407.08574">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Non-maximal entanglement of photons from positron-electron annihilation demonstrated using a novel plastic PET scanner </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">P. Moskal</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">D. Kumar</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Beyene%2C+E+Y">E. Y. Beyene</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Coussat%2C+A">A. Coussat</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Jasinska%2C+B">B. Jasinska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplanoglu%2C+T">T. Kaplanoglu</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Lisowski%2C+E">E. Lisowski</a>, <a href="/search/physics?searchtype=author&query=Lisowski%2C+F">F. Lisowski</a>, <a href="/search/physics?searchtype=author&query=Mryka%2C+W">W. Mryka</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">S. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">S. Parzych</a>, <a href="/search/physics?searchtype=author&query=del+Rio%2C+E+P">E. P. del Rio</a>, <a href="/search/physics?searchtype=author&query=Raczynski%2C+L">L. Raczynski</a>, <a href="/search/physics?searchtype=author&query=Radler%2C+M">M. Radler</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.08574v2-abstract-short" style="display: inline;"> In the state-of-the-art Positron Emission Tomography (PET), information about the polarization of annihilation photons is not available. Current PET systems track molecules labeled with positron-emitting radioisotopes by detecting the propagation direction of two photons from positron-electron annihilation. However, annihilation photons carry more information than just the site where they originat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.08574v2-abstract-full').style.display = 'inline'; document.getElementById('2407.08574v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.08574v2-abstract-full" style="display: none;"> In the state-of-the-art Positron Emission Tomography (PET), information about the polarization of annihilation photons is not available. Current PET systems track molecules labeled with positron-emitting radioisotopes by detecting the propagation direction of two photons from positron-electron annihilation. However, annihilation photons carry more information than just the site where they originated. Here we present a novel J-PET scanner built from plastic scintillators, in which annihilation photons interact predominantly via the Compton effect, providing information about photon polarization in addition to information on photon direction of propagation. Theoretically, photons from the decay of positronium in a vacuum are maximally entangled in polarization. However, in matter, when the positron from positronium annihilates with the electron bound to the atom, the question arises whether the photons from such annihilation are maximally entangled. In this work, we determine the distribution of the relative angle between polarization orientations of two photons from positron-electron annihilation in a porous polymer. Contrary to prior results for positron annihilation in aluminum and copper, where the strength of observed correlations is as expected for maximally entangled photons, our results show a significant deviation. We demonstrate that in porous polymer, photon polarization correlation is weaker than for maximally entangled photons but stronger than for separable photons. The data indicate that more than 40% of annihilations in Amberlite resin lead to a non-maximally entangled state. Our result indicates the degree of correlation depends on the annihilation mechanism and the molecular arrangement. We anticipate that the introduced Compton interaction-based PET system opens a promising perspective for exploring polarization correlations in PET as a novel diagnostic indicator. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.08574v2-abstract-full').style.display = 'none'; document.getElementById('2407.08574v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07171">arXiv:2309.07171</a> <span> [<a href="https://arxiv.org/pdf/2309.07171">pdf</a>, <a href="https://arxiv.org/format/2309.07171">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Feasibility studies for imaging e$^{+}$e$^{-}$ annihilation with modular multi-strip detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Povolo%2C+L">L. Povolo</a>, <a href="/search/physics?searchtype=author&query=Mariazzi%2C+S">S. Mariazzi</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">D. Kumar</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">S. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Baran%2C+J">J. Baran</a>, <a href="/search/physics?searchtype=author&query=Beyene%2C+E">E. Beyene</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Coussat%2C+A">A. Coussat</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Eliyan%2C+K">K. Eliyan</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gupta%2C+N">N. Gupta</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Kaplanoglu%2C+T">T. Kaplanoglu</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a> , et al. (19 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.07171v1-abstract-short" style="display: inline;"> Studies based on imaging the annihilation of the electron (e$^{-}$) and its antiparticle positron (e$^{+}$) open up several interesting applications in nuclear medicine and fundamental research. The annihilation process involves both the direct conversion of e$^{+}$e$^{-}$ into photons and the formation of their atomically bound state, the positronium atom (Ps), which can be used as a probe for fu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07171v1-abstract-full').style.display = 'inline'; document.getElementById('2309.07171v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07171v1-abstract-full" style="display: none;"> Studies based on imaging the annihilation of the electron (e$^{-}$) and its antiparticle positron (e$^{+}$) open up several interesting applications in nuclear medicine and fundamental research. The annihilation process involves both the direct conversion of e$^{+}$e$^{-}$ into photons and the formation of their atomically bound state, the positronium atom (Ps), which can be used as a probe for fundamental studies. With the ability to produce large quantities of Ps, manipulate them in long-lived Ps states, and image their annihilations after a free fall or after passing through atomic interferometers, this purely leptonic antimatter system can be used to perform inertial sensing studies in view of a direct test of Einstein equivalence principle. It is envisioned that modular multistrip detectors can be exploited as potential detection units for this kind of studies. In this work, we report the results of the first feasibility study performed on a e$^{+}$ beamline using two detection modules to evaluate their reconstruction performance and spatial resolution for imaging e$^{+}$e$^{-}$ annihilations and thus their applicability for gravitational studies of Ps. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07171v1-abstract-full').style.display = 'none'; document.getElementById('2309.07171v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.14359">arXiv:2302.14359</a> <span> [<a href="https://arxiv.org/pdf/2302.14359">pdf</a>, <a href="https://arxiv.org/format/2302.14359">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Feasibility of the J-PET to monitor range of therapeutic proton beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baran%2C+J">Jakub Baran</a>, <a href="/search/physics?searchtype=author&query=Borys%2C+D">Damian Borys</a>, <a href="/search/physics?searchtype=author&query=Brzezi%C5%84ski%2C+K">Karol Brzezi艅ski</a>, <a href="/search/physics?searchtype=author&query=Gajewski%2C+J">Jan Gajewski</a>, <a href="/search/physics?searchtype=author&query=Silarski%2C+M">Micha艂 Silarski</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">Neha Chug</a>, <a href="/search/physics?searchtype=author&query=Coussat%2C+A">Aur茅lien Coussat</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">Eryk Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">Meysam Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">Kamil Dulski</a>, <a href="/search/physics?searchtype=author&query=Eliyan%2C+K+V">Kavya V. Eliyan</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+A+G+K">Aleksander Gajos Krzysztof Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁ukasz Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">Konrad Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Konieczka%2C+P">Pawe艂 Konieczka</a>, <a href="/search/physics?searchtype=author&query=Kope%C4%87%2C+R">Renata Kope膰</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">Grzegorz Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">Tomasz Kozik</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">Wojciech Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">Deepak Kumar</a>, <a href="/search/physics?searchtype=author&query=Lomax%2C+A+J">Antony J. Lomax</a>, <a href="/search/physics?searchtype=author&query=McNamara%2C+K">Keegan McNamara</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Szymon Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Olko%2C+P">Pawe艂 Olko</a>, <a href="/search/physics?searchtype=author&query=Panek%2C+D">Dominik Panek</a> , et al. (18 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.14359v1-abstract-short" style="display: inline;"> Objective: The aim of this work is to investigate the feasibility of the Jagiellonian Positron Emission Tomography (J-PET) scanner for intra-treatment proton beam range monitoring. Approach: The Monte Carlo simulation studies with GATE and PET image reconstruction with CASToR were performed in order to compare six J-PET scanner geometries (three dual-heads and three cylindrical). We simulated prot… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.14359v1-abstract-full').style.display = 'inline'; document.getElementById('2302.14359v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.14359v1-abstract-full" style="display: none;"> Objective: The aim of this work is to investigate the feasibility of the Jagiellonian Positron Emission Tomography (J-PET) scanner for intra-treatment proton beam range monitoring. Approach: The Monte Carlo simulation studies with GATE and PET image reconstruction with CASToR were performed in order to compare six J-PET scanner geometries (three dual-heads and three cylindrical). We simulated proton irradiation of a PMMA phantom with a Single Pencil Beam (SPB) and Spread-Out Bragg Peak (SOBP) of various ranges. The sensitivity and precision of each scanner were calculated, and considering the setup's cost-effectiveness, we indicated potentially optimal geometries for the J-PET scanner prototype dedicated to the proton beam range assessment. Main results: The investigations indicate that the double-layer cylindrical and triple-layer double-head configurations are the most promising for clinical application. We found that the scanner sensitivity is of the order of 10$^{-5}$ coincidences per primary proton, while the precision of the range assessment for both SPB and SOBP irradiation plans was found below 1 mm. Among the scanners with the same number of detector modules, the best results are found for the triple-layer dual-head geometry. Significance: We performed simulation studies demonstrating that the feasibility of the J-PET detector for PET-based proton beam therapy range monitoring is possible with reasonable sensitivity and precision enabling its pre-clinical tests in the clinical proton therapy environment. Considering the sensitivity, precision and cost-effectiveness, the double-layer cylindrical and triple-layer dual-head J-PET geometry configurations seem promising for the future clinical application. Experimental tests are needed to confirm these findings. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.14359v1-abstract-full').style.display = 'none'; document.getElementById('2302.14359v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 7 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.02832">arXiv:2301.02832</a> <span> [<a href="https://arxiv.org/pdf/2301.02832">pdf</a>, <a href="https://arxiv.org/format/2301.02832">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/18/02/C02027">10.1088/1748-0221/18/02/C02027 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> J-PET detection modules based on plastic scintillators for performing studies with positron and positronium beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Baran%2C+J">J. Baran</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Coussat%2C+A">A. Coussat</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Eliyan%2C+K">K. Eliyan</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Konieczka%2C+P">P. Konieczka</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">D. Kumar</a>, <a href="/search/physics?searchtype=author&query=Mariazzi%2C+S">S. Mariazzi</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">S. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Panasa%2C+L">L. Panasa</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">S. Parzych</a> , et al. (11 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.02832v1-abstract-short" style="display: inline;"> The J-PET detector, which consists of inexpensive plastic scintillators, has demonstrated its potential in the study of fundamental physics. In recent years, a prototype with 192 plastic scintillators arranged in 3 layers has been optimized for the study of positronium decays. This allows performing precision tests of discrete symmetries (C, P, T) in the decays of positronium atoms. Moreover, than… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.02832v1-abstract-full').style.display = 'inline'; document.getElementById('2301.02832v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.02832v1-abstract-full" style="display: none;"> The J-PET detector, which consists of inexpensive plastic scintillators, has demonstrated its potential in the study of fundamental physics. In recent years, a prototype with 192 plastic scintillators arranged in 3 layers has been optimized for the study of positronium decays. This allows performing precision tests of discrete symmetries (C, P, T) in the decays of positronium atoms. Moreover, thanks to the possibility of measuring the polarization direction of the photon based on Compton scattering, the predicted entanglement between the linear polarization of annihilation photons in positronium decays can also be studied. Recently, a new J-PET prototype was commissioned, based on a modular design of detection units. Each module consists of 13 plastic scintillators and can be used as a stand-alone, compact and portable detection unit. In this paper, the main features of the J-PET detector, the modular prototype and their applications for possible studies with positron and positronium beams are discussed. Preliminary results of the first test experiment performed on two detection units in the continuous positron beam recently developed at the Antimatter Laboratory (AML) of Trento are also reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.02832v1-abstract-full').style.display = 'none'; document.getElementById('2301.02832v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.02285">arXiv:2212.02285</a> <span> [<a href="https://arxiv.org/pdf/2212.02285">pdf</a>, <a href="https://arxiv.org/format/2212.02285">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Realistic Total-Body J-PET Geometry Optimization -- Monte Carlo Study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baran%2C+J">Jakub Baran</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">Wojciech Krzemien</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">Lech Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Ba%C5%82a%2C+M">Mateusz Ba艂a</a>, <a href="/search/physics?searchtype=author&query=Coussat%2C+A">Aurelien Coussat</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">Szymon Parzych</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">Neha Chug</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">Eryk Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C+O">Catalina Oana Curceanu</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">Meysam Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">Kamil Dulski</a>, <a href="/search/physics?searchtype=author&query=Eliyan%2C+K">Kavya Eliyan</a>, <a href="/search/physics?searchtype=author&query=Gajewski%2C+J">Jan Gajewski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">Aleksander Gajos</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B">Beatrix Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">Krzysztof Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁ukasz Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">Konrad Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">Grzegorz Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">Tomasz Kozik</a>, <a href="/search/physics?searchtype=author&query=Kumar%2C+D">Deepak Kumar</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Szymon Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Panek%2C+D">Dominik Panek</a>, <a href="/search/physics?searchtype=author&query=del+Rio%2C+E+P">Elena Perez del Rio</a>, <a href="/search/physics?searchtype=author&query=Ruci%C5%84ski%2C+A">Antoni Ruci艅ski</a> , et al. (9 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.02285v3-abstract-short" style="display: inline;"> Total-Body PET is one of the most promising medical diagnostics modalities. The high sensitivity provided by Total-Body technology can be advantageous for novel tomography methods like positronium imaging. Several efforts are ongoing to lower the price of the TB-PET systems. Among the alternatives, the Jagiellonian PET (J-PET) technology, based on plastic scintillator strips, offers a low-cost alt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.02285v3-abstract-full').style.display = 'inline'; document.getElementById('2212.02285v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.02285v3-abstract-full" style="display: none;"> Total-Body PET is one of the most promising medical diagnostics modalities. The high sensitivity provided by Total-Body technology can be advantageous for novel tomography methods like positronium imaging. Several efforts are ongoing to lower the price of the TB-PET systems. Among the alternatives, the Jagiellonian PET (J-PET) technology, based on plastic scintillator strips, offers a low-cost alternative. The work aimed to compare five Total-Body J-PET geometries as a possible next generation J-PET scanner design. We present comparative studies of performance characteristics of the cost-effective Total-Body PET scanners using J-PET technology. We investigated in silico five Total-Body scanner geometries. Monte Carlo simulations of the XCAT phantom, the 2-meter sensitivity line source and positronium sensitivity phantoms were performed. We compared the sensitivity profiles for 2-gamma and 3-gamma tomography, relative cost of the setups and performed quantitative analysis of the reconstructed images. The analysis of the reconstructed XCAT images reveals the superiority of the seven-ring scanners over the three-ring setups. However, the three-ring scanners would be approximately 2-3 times cheaper. The peak sensitivity values for two-gamma vary from 20 to 34 cps/kBq. The sensitivity curves for the positronium tomography have a similar shape to the two-gamma sensitivity profiles. The peak values are lower compared to the two-gamma cases, from about 20-28 times, with a maximum of 1.66 cps/kBq. The results show the feasibility of multi-organ imaging of all the systems to be considered for the next generation of TB J-PET designs. The relative cost for all the scanners is about 10-4 times lower compared to the cost of the uExplorer. These properties coupled together with J-PET cost-effectiveness, make the J-PET technology an attractive solution for broad application in clinics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.02285v3-abstract-full').style.display = 'none'; document.getElementById('2212.02285v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.08741">arXiv:2112.08741</a> <span> [<a href="https://arxiv.org/pdf/2112.08741">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/sciadv.abh4394">10.1126/sciadv.abh4394 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Positronium imaging with the novel multiphoton PET scanner </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">Pawe艂 Moskal</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">Kamil Dulski</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">Neha Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">Catalina Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">Eryk Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">Meysam Dadgar</a>, <a href="/search/physics?searchtype=author&query=Gajewski%2C+J">Jan Gajewski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">Aleksander Gajos</a>, <a href="/search/physics?searchtype=author&query=Grudzie%C5%84%2C+G">Grzegorz Grudzie艅</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">Beatrix C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">Krzysztof Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁ukasz Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Karimi%2C+H">Hanieh Karimi</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">Konrad Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">Grzegorz Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">Pawe艂 Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">Tomasz Kozik</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">Nikodem Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">Wojciech Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">Ewelina Kubicz</a>, <a href="/search/physics?searchtype=author&query=Ma%C5%82czak%2C+P">Piotr Ma艂czak</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Szymon Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pawlik-Nied%C5%BAwiecka%2C+M">Monika Pawlik-Nied藕wiecka</a>, <a href="/search/physics?searchtype=author&query=P%C4%99dziwiatr%2C+M">Micha艂 P臋dziwiatr</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">Lech Raczy艅ski</a> , et al. (11 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.08741v1-abstract-short" style="display: inline;"> In vivo assessment of cancer and precise location of altered tissues at initial stages of molecular disorders are important diagnostic challenges. Positronium is copiously formed in the free molecular spaces in the patient's body during positron emission tomography (PET). The positronium properties vary according to the size of inter- and intramolecular voids and the concentration of molecules in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.08741v1-abstract-full').style.display = 'inline'; document.getElementById('2112.08741v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.08741v1-abstract-full" style="display: none;"> In vivo assessment of cancer and precise location of altered tissues at initial stages of molecular disorders are important diagnostic challenges. Positronium is copiously formed in the free molecular spaces in the patient's body during positron emission tomography (PET). The positronium properties vary according to the size of inter- and intramolecular voids and the concentration of molecules in them such as, e.g., molecular oxygen, O2; therefore, positronium imaging may provide information about disease progression during the initial stages of molecular alterations. Current PET systems do not allow acquisition of positronium images. This study presents a new method that enables positronium imaging by simultaneous registration of annihilation photons and deexcitation photons from pharmaceuticals labeled with radionuclides. The first positronium imaging of a phantom built from cardiac myxoma and adipose tissue is demonstrated. It is anticipated that positronium imaging will substantially enhance the specificity of PET diagnostics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.08741v1-abstract-full').style.display = 'none'; document.getElementById('2112.08741v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science Advances 7 (2021) eabh4394 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.12750">arXiv:2107.12750</a> <span> [<a href="https://arxiv.org/pdf/2107.12750">pdf</a>, <a href="https://arxiv.org/format/2107.12750">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.media.2021.102199">10.1016/j.media.2021.102199 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimisation of the event-based TOF filtered back-projection for online imaging in total-body J-PET </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shopa%2C+R+Y">R. Y. Shopa</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Kopka%2C+P">P. Kopka</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">L. Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Wi%C5%9Blicki%2C+W">W. Wi艣licki</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Sz. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Raj%2C+J">J. Raj</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Shivani"> Shivani</a>, <a href="/search/physics?searchtype=author&query=St%C8%A9pie%C5%84%2C+E+L">E. L. St醛pie艅</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.12750v1-abstract-short" style="display: inline;"> We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most likely position of electron-positron annihilation, estimated from the emissions of back-to-back $纬$-photons. The optimisation of its parameters is stud… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.12750v1-abstract-full').style.display = 'inline'; document.getElementById('2107.12750v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.12750v1-abstract-full" style="display: none;"> We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most likely position of electron-positron annihilation, estimated from the emissions of back-to-back $纬$-photons. The optimisation of its parameters is studied using Monte Carlo simulations of a 1-mm spherical source, NEMA IEC and XCAT phantoms inside the ideal J-PET scanner. The combination of high-pass filters which included the TOF filtered back-projection (FBP), resulted in spatial resolution, 1.5 $\times$ higher in the axial direction than for the conventional 3D FBP. For realistic $10$-minute scans of NEMA IEC and XCAT, which require a trade-off between the noise and spatial resolution, the need for Gaussian TOF kernel components, coupled with median post-filtering, is demonstrated. The best sets of 3D filter parameters were obtained by the Nelder-Mead minimisation of the mean squared error between the resulting and reference images. The approach allows training the reconstruction algorithm for custom scans, using the IEC phantom, when the temporal resolution is below 50 ps. The image quality parameters, estimated for the best outcomes, were systematically better than for the non-TOF FBP. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.12750v1-abstract-full').style.display = 'none'; document.getElementById('2107.12750v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.01356">arXiv:2107.01356</a> <span> [<a href="https://arxiv.org/pdf/2107.01356">pdf</a>, <a href="https://arxiv.org/format/2107.01356">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6560/ac16bd">10.1088/1361-6560/ac16bd <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simulating NEMA characteristics of the modular total-body J-PET scanner -- an economic total-body PET from plastic scintillators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">Pawe艂 Moskal</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">Pawe艂 Kowalski</a>, <a href="/search/physics?searchtype=author&query=Shopa%2C+R">Roman Shopa</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">Lech Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Baran%2C+J">Jakub Baran</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">Neha Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">Catalina Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">Eryk Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">Meysam Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">Kamil Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">Aleksander Gajos</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B">Beatrix Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">Krzysztof Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁ukasz Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">Daria Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">Konrad Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Kopka%2C+P">Przemys艂aw Kopka</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">Gregorz Korcyl</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">Nikodem Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">Wojciech Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">Ewelina Kubicz</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Szymon Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Parzych%2C+S">Szymon Parzych</a>, <a href="/search/physics?searchtype=author&query=Raj%2C+J">Juhi Raj</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">Sushil Sharma</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.01356v1-abstract-short" style="display: inline;"> The purpose of the presented research is estimation of the performance characteristics of the economic Total-Body Jagiellonian-PET system (TB-J-PET) constructed from plastic scintillators. The characteristics are estimated according to the NEMA NU-2-2018 standards utilizing the GATE package. The simulated detector consists of 24 modules, each built out of 32 plastic scintillator strips (each with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.01356v1-abstract-full').style.display = 'inline'; document.getElementById('2107.01356v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.01356v1-abstract-full" style="display: none;"> The purpose of the presented research is estimation of the performance characteristics of the economic Total-Body Jagiellonian-PET system (TB-J-PET) constructed from plastic scintillators. The characteristics are estimated according to the NEMA NU-2-2018 standards utilizing the GATE package. The simulated detector consists of 24 modules, each built out of 32 plastic scintillator strips (each with cross section of 6 mm times 30 mm and length of 140 cm or 200 cm) arranged in two layers in regular 24-sided polygon circumscribing a circle with the diameter of 78.6 cm. For the TB-J-PET with an axial field-of-view (AFOV) of 200 cm, a spatial resolutions of 3.7 mm (transversal) and 4.9 mm (axial) are achieved. The NECR peak of 630 kcps is expected at 30 kBq/cc activity concentration and the sensitivity at the center amounts to 38 cps/kBq. The SF is estimated to 36.2 %. The values of SF and spatial resolution are comparable to those obtained for the state-of-the-art clinical PET scanners and the first total-body tomographs: uExplorer and PennPET. With respect to the standard PET systems with AFOV in the range from 16 cm to 26 cm, the TB-J-PET is characterized by an increase in NECR approximately by factor of 4 and by the increase of the whole-body sensitivity by factor of 12.6 to 38. The TOF resolution for the TB-J-PET is expected to be at the level of CRT=240 ps (FWHM). For the TB-J-PET with an axial field-of-view (AFOV) of 140 cm, an image quality of the reconstructed images of a NEMA IEC phantom was presented with a contrast recovery coefficient (CRC) and a background variability parameters. The increase of the whole-body sensitivity and NECR estimated for the TB-J-PET with respect to current commercial PET systems makes the TB-J-PET a promising cost-effective solution for the broad clinical applications of total-body PET scanners. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.01356v1-abstract-full').style.display = 'none'; document.getElementById('2107.01356v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">31 pages, 11 figures, 6 tables, submitted to Physics in Medicine and Biology 2021</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.10868">arXiv:2008.10868</a> <span> [<a href="https://arxiv.org/pdf/2008.10868">pdf</a>, <a href="https://arxiv.org/format/2008.10868">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TIM.2020.3018515">10.1109/TIM.2020.3018515 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Synchronisation and calibration of the 24-modules J-PET prototype with 300~mm axial field of view </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">P. Moskal</a>, <a href="/search/physics?searchtype=author&query=Bednarski%2C+T">T. Bednarski</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">Sz. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Silarski%2C+M">M. Silarski</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Chhokar%2C+J">J. Chhokar</a>, <a href="/search/physics?searchtype=author&query=Ba%C5%82a%2C+M">M. Ba艂a</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Del+Grande%2C+R">R. Del Grande</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Gupta-Sharma%2C+N">N. Gupta-Sharma</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasinska%2C+B">B. Jasinska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Karimi%2C+H">H. Karimi</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2008.10868v1-abstract-short" style="display: inline;"> Research conducted in the framework of the J-PET project aims to develop a cost-effective total-body positron emission tomography scanner. As a first step on the way to construct a full-scale J-PET tomograph from long strips of plastic scintillators, a 24-strip prototype was built and tested. The prototype consists of detection modules arranged axially forming a cylindrical diagnostic chamber with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.10868v1-abstract-full').style.display = 'inline'; document.getElementById('2008.10868v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.10868v1-abstract-full" style="display: none;"> Research conducted in the framework of the J-PET project aims to develop a cost-effective total-body positron emission tomography scanner. As a first step on the way to construct a full-scale J-PET tomograph from long strips of plastic scintillators, a 24-strip prototype was built and tested. The prototype consists of detection modules arranged axially forming a cylindrical diagnostic chamber with the inner diameter of 360 mm and the axial field-of-view of 300 mm. Promising perspectives for a low-cost construction of a total-body PET scanner are opened due to an axial arrangement of strips of plastic scintillators, wchich have a small light attenuation, superior timing properties, and the possibility of cost-effective increase of the axial field-of-view. The presented prototype comprises dedicated solely digital front-end electronic circuits and a triggerless data acquisition system which required development of new calibration methods including time, thresholds and gain synchronization. The system and elaborated calibration methods including first results of the 24-module J-PET prototype are presented and discussed. The achieved coincidence resolving time equals to CRT = 490 $\pm$ 9 ps. This value can be translated to the position reconstruction accuracy $蟽(螖l) =$ 18 mm which is fairly position-independent. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.10868v1-abstract-full').style.display = 'none'; document.getElementById('2008.10868v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication in IEEE Transactions on Instrumentation and Measurement</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.07467">arXiv:2006.07467</a> <span> [<a href="https://arxiv.org/pdf/2006.07467">pdf</a>, <a href="https://arxiv.org/format/2006.07467">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2021.165452">10.1016/j.nima.2021.165452 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The J-PET detector -- a tool for precision studies of ortho-positronium decays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Bass%2C+S+D">S. D. Bass</a>, <a href="/search/physics?searchtype=author&query=Chhokar%2C+J">J. Chhokar</a>, <a href="/search/physics?searchtype=author&query=Chug%2C+N">N. Chug</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Gajewski%2C+J">J. Gajewski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Del+Grande%2C+R">R. Del Grande</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Karimi%2C+H">H. Karimi</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Kopka%2C+P">P. Kopka</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a> , et al. (19 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.07467v3-abstract-short" style="display: inline;"> The J-PET tomograph is constructed from plastic scintillator strips arranged axially in concentric cylindrical layers. It enables investigations of positronium decays by measurement of the time, position, polarization and energy deposited by photons in the scintillators, in contrast to studies conducted so far with crystal and semiconductor based detection systems where the key selection of events… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.07467v3-abstract-full').style.display = 'inline'; document.getElementById('2006.07467v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.07467v3-abstract-full" style="display: none;"> The J-PET tomograph is constructed from plastic scintillator strips arranged axially in concentric cylindrical layers. It enables investigations of positronium decays by measurement of the time, position, polarization and energy deposited by photons in the scintillators, in contrast to studies conducted so far with crystal and semiconductor based detection systems where the key selection of events is based on the measurement of the photons energies. In this article we show that the J-PET tomograph system is capable of exclusive measurements of the decays of ortho-positronium atoms. We present the first positronium production results, its lifetime distribution measurements and discuss estimation of the influence of various background sources. The tomograph s performance demonstrated here makes it suitable for precision studies of positronium decays including entanglement of the final state photons, positron annihilation lifetime spectroscopy plus molecular imaging diagnostics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.07467v3-abstract-full').style.display = 'none'; document.getElementById('2006.07467v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.12742">arXiv:2004.12742</a> <span> [<a href="https://arxiv.org/pdf/2004.12742">pdf</a>, <a href="https://arxiv.org/format/2004.12742">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Hit-time and hit-position reconstruction in strips of plastic scintillators using multi-threshold readouts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sharma%2C+N+G">N. G. Sharma</a>, <a href="/search/physics?searchtype=author&query=Silarski%2C+M">M. Silarski</a>, <a href="/search/physics?searchtype=author&query=Chhokar%2C+J">J. Chhokar</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Farbaniec%2C+K">K. Farbaniec</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Del+Grande%2C+R">R. Del Grande</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasinska%2C+B">B. Jasinska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">Sz. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Palka%2C+M">M. Palka</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.12742v1-abstract-short" style="display: inline;"> In this article, a new method for the reconstruction of hit-position and hit-time of photons in long scintillator detectors is investigated. This research is motivated by the recent development of the positron emission tomography scanners based on plastic scintillators. The proposed method constitutes a new way of signal processing in Multi-Voltage-Technique. It is based on the determination of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.12742v1-abstract-full').style.display = 'inline'; document.getElementById('2004.12742v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.12742v1-abstract-full" style="display: none;"> In this article, a new method for the reconstruction of hit-position and hit-time of photons in long scintillator detectors is investigated. This research is motivated by the recent development of the positron emission tomography scanners based on plastic scintillators. The proposed method constitutes a new way of signal processing in Multi-Voltage-Technique. It is based on the determination of the degree of similarity between the registered signals and the synchronized model signals stored in a library. The library was established for a set of well defined hit-positions along the length of the scintillator. The Mahalanobis distance was used as a measure of similarity between the two compared signals. The method was validated on the experimental data measured using two-strips J-PET prototype with dimensions of 5x9x300 mm$^3$. The obtained Time-of-Flight (TOF) and spatial resolutions amount to 325~ps (FWHM) and 25~mm (FWHM), respectively. The TOF resolution was also compared to the results of an analogous study done using Linear Fitting method. The best TOF resolution was obtained with this method at four pre-defined threshold levels which was comparable to the resolution achieved from the Mahalanobis distance at two pre-defined threshold levels. Although the algorithm of Linear Fitting method is much simpler to apply than the Mahalanobis method, the application of the Mahalanobis distance requires a lower number of applied threshold levels and, hence, decreases the costs of electronics used in PET scanner. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.12742v1-abstract-full').style.display = 'none'; document.getElementById('2004.12742v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.10183">arXiv:2002.10183</a> <span> [<a href="https://arxiv.org/pdf/2002.10183">pdf</a>, <a href="https://arxiv.org/format/2002.10183">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Software Engineering">cs.SE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.softx.2020.100487">10.1016/j.softx.2020.100487 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> J-PET Framework: Software platform for PET tomography data reconstruction and analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">Wojciech Krzemien</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">Aleksander Gajos</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">Krzysztof Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Rakoczy%2C+K">Kamil Rakoczy</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">Grzegorz Korcyl</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.10183v2-abstract-short" style="display: inline;"> J-PET Framework is an open-source software platform for data analysis, written in C++ and based on the ROOT package. It provides a common environment for implementation of reconstruction, calibration and filtering procedures, as well as for user-level analyses of Positron Emission Tomography data. The library contains a set of building blocks that can be combined by users with even little programm… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.10183v2-abstract-full').style.display = 'inline'; document.getElementById('2002.10183v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.10183v2-abstract-full" style="display: none;"> J-PET Framework is an open-source software platform for data analysis, written in C++ and based on the ROOT package. It provides a common environment for implementation of reconstruction, calibration and filtering procedures, as well as for user-level analyses of Positron Emission Tomography data. The library contains a set of building blocks that can be combined by users with even little programming experience, into chains of processing tasks through a convenient, simple and well-documented API. The generic input-output interface allows processing the data from various sources: low-level data from the tomography acquisition system or from diagnostic setups such as digital oscilloscopes, as well as high-level tomography structures e.g. sinograms or a list of lines-of-response. Moreover, the environment can be interfaced with Monte Carlo simulation packages such as GEANT and GATE, which are commonly used in the medical scientific community. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.10183v2-abstract-full').style.display = 'none'; document.getElementById('2002.10183v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> SoftwareX 11 (2020) 100487 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.12059">arXiv:1911.12059</a> <span> [<a href="https://arxiv.org/pdf/1911.12059">pdf</a>, <a href="https://arxiv.org/format/1911.12059">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Estimating relationship between the Time Over Threshold and energy loss by photons in plastic scintillators used in the J-PET scanner </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Chhokar%2C+J">J. Chhokar</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Dadgar%2C+M">M. Dadgar</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajewski%2C+J">J. Gajewski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Gupta-Sharma%2C+N">N. Gupta-Sharma</a>, <a href="/search/physics?searchtype=author&query=Del+Grande%2C+R">R. Del Grande</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasinska%2C+B">B. Jasinska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Karimi%2C+H">H. Karimi</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.12059v1-abstract-short" style="display: inline;"> Time-Over-Threshold (TOT) technique is being used widely due to its implications in developing the multi channel readouts mainly when fast signal processing is required. Using TOT technique as a measure of energy loss instead of charge integration methods significantly reduces the signals readout cost by combining the time and energy information. Therefore, this approach can potentially be used in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.12059v1-abstract-full').style.display = 'inline'; document.getElementById('1911.12059v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.12059v1-abstract-full" style="display: none;"> Time-Over-Threshold (TOT) technique is being used widely due to its implications in developing the multi channel readouts mainly when fast signal processing is required. Using TOT technique as a measure of energy loss instead of charge integration methods significantly reduces the signals readout cost by combining the time and energy information. Therefore, this approach can potentially be used in J-PET tomograph which is build from plastic scintillators characterized by fast light signals. The drawback in adopting this technique is lying in the non-linear correlation between input energy loss and TOT of the signal. The main motivation behind this work is to develop the relationship between TOT and energy loss and validate it with the J-PET tomograph. The experiment was performed using the $^{22}$Na beta emitter source placed in the center of the J-PET tomograph. One can obtain primary photons of two different energies: 511 keV photon from the annihilation of positron (direct annihilation or through the formation of para-Positronim atom or pick-off process of ortho-Positronium atoms), and 1275 keV prompt photon. This allows to study the correlation between TOT values and energy loss for energy range up to 1000 keV. As the photon interacts dominantly via Compton scattering inside the plastic scintillator, there is no direct information of primary photon energy. However, using the J-PET geometry one can measure the scattering angle of the interacting photon. Since, $^{22}$Na source emits photons of two different energies, it is required to know unambiguously the energy of incident photons and its corresponding scattering angle for the estimation of energy deposition. In this work, the relationship between Time Over Threshold and energy loss by interacting photons inside the plastic scintillators used in J-PET scanner is established for a energy deposited range 100-1000 keV <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.12059v1-abstract-full').style.display = 'none'; document.getElementById('1911.12059v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.10589">arXiv:1911.10589</a> <span> [<a href="https://arxiv.org/pdf/1911.10589">pdf</a>, <a href="https://arxiv.org/format/1911.10589">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.5506/APhysPolB.51.165">10.5506/APhysPolB.51.165 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Feasibility of ortho-positronium lifetime studies with the J-PET detector in context of mirror matter models </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=del+Rio%2C+E+P">E. Perez del Rio</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">Krzysztof Kacprzak</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.10589v1-abstract-short" style="display: inline;"> We discuss the possibility to perform the experimental searches of invisible decays in the ortho-positronium system with the J-PET detector </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.10589v1-abstract-full" style="display: none;"> We discuss the possibility to perform the experimental searches of invisible decays in the ortho-positronium system with the J-PET detector <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.10589v1-abstract-full').style.display = 'none'; document.getElementById('1911.10589v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Acta Phys. Pol. B 51 (2020) 165 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.06841">arXiv:1911.06841</a> <span> [<a href="https://arxiv.org/pdf/1911.06841">pdf</a>, <a href="https://arxiv.org/format/1911.06841">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Performance assessment of the 2$纬$ positronium imaging with the total-body PET scanners </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">P. Moskal</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Bura%2C+Z">Z. Bura</a>, <a href="/search/physics?searchtype=author&query=Chhokar%2C+C">C. Chhokar</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=1%2C+M+D">M. Dadgar 1</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajewski%2C+J">J. Gajewski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Del+Grande%2C+R">R. Del Grande</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kami%C5%84ska%2C+A">A. Kami艅ska</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Karimi%2C+H">H. Karimi</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Ma%C5%82czak%2C+P">P. Ma艂czak</a> , et al. (17 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.06841v1-abstract-short" style="display: inline;"> In living organisms the positron-electron annihilation (occurring during the PET imaging) proceeds in about 30% via creation of a metastable ortho-positronium atom. In the tissue, due to the pick-off and conversion processes, over 98% of ortho-positronia annihilate into two 511~keV photons. In this article we assess the feasibility for reconstruction of the mean ortho-positronium lifetime image ba… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.06841v1-abstract-full').style.display = 'inline'; document.getElementById('1911.06841v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.06841v1-abstract-full" style="display: none;"> In living organisms the positron-electron annihilation (occurring during the PET imaging) proceeds in about 30% via creation of a metastable ortho-positronium atom. In the tissue, due to the pick-off and conversion processes, over 98% of ortho-positronia annihilate into two 511~keV photons. In this article we assess the feasibility for reconstruction of the mean ortho-positronium lifetime image based on annihilations into two photons. The main objectives of this work include: (i) estimation of the sensitivity of the total-body PET scanners for the ortho-positronium mean lifetime imaging using $2纬$ annihilations, and (ii) estimation of the spatial and time resolution of the ortho-positronium image as a function of the coincidence resolving time (CRT) of the scanner. Simulations are conducted assuming that radiopharmaceutical is labelled with $^{44}Sc$ isotope emitting one positron and one prompt gamma. The image is reconstructed on the basis of triple coincidence events. The ortho-positronium lifetime spectrum is determined for each voxel of the image. Calculations were performed for cases of total-body detectors build of (i) LYSO scintillators as used in the EXPLORER PET, and (ii) plastic scintillators as anticipated for the cost-effective total-body J-PET scanner. To assess the spatial and time resolution the three cases were considered assuming that CRT is equal to 140ps, 50ps and 10ps. The estimated total-body PET sensitivity for the registration and selection of image forming triple coincidences is larger by a factor of 12.2 (for LYSO PET) and by factor of 4.7 (for plastic PET) with respect to the sensitivity for the standard $2纬$ imaging by LYSO PET scanners with AFOV=20cm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.06841v1-abstract-full').style.display = 'none'; document.getElementById('1911.06841v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.06204">arXiv:1901.06204</a> <span> [<a href="https://arxiv.org/pdf/1901.06204">pdf</a>, <a href="https://arxiv.org/format/1901.06204">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-019-1629-0">10.1007/s10751-019-1629-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simulation studies of annihilation-photon's polarisation via Compton scattering with the J-PET tomograph </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Gupta-Sharma%2C+N">N. Gupta-Sharma</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Sz. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pa%C5%82ka%2C+M">M. Pa艂ka</a>, <a href="/search/physics?searchtype=author&query=Pawlik-Nied%C5%BAwiecka%2C+M">M. Pawlik-Nied藕wiecka</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">L. Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Raj%2C+J">J. Raj</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.06204v1-abstract-short" style="display: inline;"> J-PET is the first positron-emission tomograph (PET) constructed from plastic scintillators. It was optimized for the detection of photons from electron-positron annihilation. Such photons, having an energy of 511 keV, interact with electrons in plastic scintillators predominantly via the Compton effect. Compton scattering is at most probable at an angle orthogonal to the electric field vector of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06204v1-abstract-full').style.display = 'inline'; document.getElementById('1901.06204v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.06204v1-abstract-full" style="display: none;"> J-PET is the first positron-emission tomograph (PET) constructed from plastic scintillators. It was optimized for the detection of photons from electron-positron annihilation. Such photons, having an energy of 511 keV, interact with electrons in plastic scintillators predominantly via the Compton effect. Compton scattering is at most probable at an angle orthogonal to the electric field vector of the interacting photon. Thus registration of multiple photon scatterings with J-PET enables to determine the polarization of the annihilation photons. In this contribution we present estimates on the physical limitation in the accuracy of the polarization determination of $511$~keV photons with the J-PET detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.06204v1-abstract-full').style.display = 'none'; document.getElementById('1901.06204v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to Hyperfine Interactions</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.10397">arXiv:1809.10397</a> <span> [<a href="https://arxiv.org/pdf/1809.10397">pdf</a>, <a href="https://arxiv.org/format/1809.10397">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-018-6461-1">10.1140/epjc/s10052-018-6461-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Feasibility studies of the polarization of photons beyond the optical wavelength regime with the J-PET detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">P. Moskal</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Ba%C5%82a%2C+M">M. Ba艂a</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Del+Grande%2C+R">R. Del Grande</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+L">L. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Sz. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pa%C5%82ka%2C+M">M. Pa艂ka</a>, <a href="/search/physics?searchtype=author&query=Raj%2C+J">J. Raj</a>, <a href="/search/physics?searchtype=author&query=Rudy%2C+Z">Z. Rudy</a> , et al. (9 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1809.10397v1-abstract-short" style="display: inline;"> J-PET is a detector optimized for registration of photons from the electron-positron annihilation via plastic scintillators where photons interact predominantly via Compton scattering. Registration of both primary and scattered photons enables to determinate the linear polarization of the primary photon on the event by event basis with a certain probability. Here we present quantitative results on… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.10397v1-abstract-full').style.display = 'inline'; document.getElementById('1809.10397v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.10397v1-abstract-full" style="display: none;"> J-PET is a detector optimized for registration of photons from the electron-positron annihilation via plastic scintillators where photons interact predominantly via Compton scattering. Registration of both primary and scattered photons enables to determinate the linear polarization of the primary photon on the event by event basis with a certain probability. Here we present quantitative results on the feasibility of such polarization measurements of photons from the decay of positronium with the J-PET and explore the physical limitations for the resolution of the polarization determination of 511 keV photons via Compton scattering. For scattering angles of about 82 deg (where the best contrast for polarization measurement is theoretically predicted) we find that the single event resolution for the determination of the polarization is about 40 deg (predominantly due to properties of the Compton effect). However, for samples larger than ten thousand events the J-PET is capable of determining relative average polarization of these photons with the precision of about few degrees. The obtained results open new perspectives for studies of various physics phenomena such as quantum entanglement and tests of discrete symmetries in decays of positronium and extend the energy range of polarization measurements by five orders of magnitude beyond the optical wavelength regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.10397v1-abstract-full').style.display = 'none'; document.getElementById('1809.10397v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 14 figures, submitted to EPJ C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.00847">arXiv:1809.00847</a> <span> [<a href="https://arxiv.org/pdf/1809.00847">pdf</a>, <a href="https://arxiv.org/format/1809.00847">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-018-1527-x">10.1007/s10751-018-1527-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A feasibility study of the time reversal violation test based on polarization of annihilation photons from the decay of ortho-Positronium with the J-PET detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Raj%2C+J">J. Raj</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Gupta-Sharma%2C+N">N. Gupta-Sharma</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kaplon%2C+L">L. Kaplon</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Klimaszewski%2C+K">K. Klimaszewski</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemien%2C+W">W. Krzemien</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Niedzwiecki%2C+S">Sz. Niedzwiecki</a>, <a href="/search/physics?searchtype=author&query=Palka%2C+M">M. Palka</a>, <a href="/search/physics?searchtype=author&query=Pawlik-Niedzwiecka%2C+M">M. Pawlik-Niedzwiecka</a>, <a href="/search/physics?searchtype=author&query=Raczynski%2C+L">L. Raczynski</a>, <a href="/search/physics?searchtype=author&query=Rakoczy%2C+K">K. Rakoczy</a> , et al. (9 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1809.00847v1-abstract-short" style="display: inline;"> The Jagiellonian Positron Emission Tomograph (J-PET) is a novel de- vice being developed at Jagiellonian University in Krakow, Poland based on or- ganic scintillators. J-PET is an axially symmetric and high acceptance scanner that can be used as a multi-purpose detector system. It is well suited to pur- sue tests of discrete symmetries in decays of positronium in addition to medical imaging. J-PET… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.00847v1-abstract-full').style.display = 'inline'; document.getElementById('1809.00847v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.00847v1-abstract-full" style="display: none;"> The Jagiellonian Positron Emission Tomograph (J-PET) is a novel de- vice being developed at Jagiellonian University in Krakow, Poland based on or- ganic scintillators. J-PET is an axially symmetric and high acceptance scanner that can be used as a multi-purpose detector system. It is well suited to pur- sue tests of discrete symmetries in decays of positronium in addition to medical imaging. J-PET enables the measurement of both momenta and the polarization vectors of annihilation photons. The latter is a unique feature of the J-PET detector which allows the study of time reversal symmetry violation operator which can be constructed solely from the annihilation photons momenta before and after the scattering in the detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.00847v1-abstract-full').style.display = 'none'; document.getElementById('1809.00847v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.10754">arXiv:1807.10754</a> <span> [<a href="https://arxiv.org/pdf/1807.10754">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TMI.2018.2837741">10.1109/TMI.2018.2837741 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evaluation of Single-Chip, Real-Time Tomographic Data Processing on FPGA - SoC Devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Bia%C5%82as%2C+P">P. Bia艂as</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Flak%2C+B">B. Flak</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=G%C5%82owacz%2C+B">B. G艂owacz</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kajetanowicz%2C+M">M. Kajetanowicz</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krawczyk%2C+N">N. Krawczyk</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Sz. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pawlik-Nied%C5%BAwiecka%2C+M">M. Pawlik-Nied藕wiecka</a>, <a href="/search/physics?searchtype=author&query=Pa%C5%82ka%2C+M">M. Pa艂ka</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">L. Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Rajda%2C+P">P. Rajda</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1807.10754v1-abstract-short" style="display: inline;"> A novel approach to tomographic data processing has been developed and evaluated using the Jagiellonian PET (J-PET) scanner as an example. We propose a system in which there is no need for powerful, local to the scanner processing facility, capable to reconstruct images on the fly. Instead we introduce a Field Programmable Gate Array (FPGA) System-on-Chip (SoC) platform connected directly to data… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.10754v1-abstract-full').style.display = 'inline'; document.getElementById('1807.10754v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.10754v1-abstract-full" style="display: none;"> A novel approach to tomographic data processing has been developed and evaluated using the Jagiellonian PET (J-PET) scanner as an example. We propose a system in which there is no need for powerful, local to the scanner processing facility, capable to reconstruct images on the fly. Instead we introduce a Field Programmable Gate Array (FPGA) System-on-Chip (SoC) platform connected directly to data streams coming from the scanner, which can perform event building, filtering, coincidence search and Region-Of-Response (ROR) reconstruction by the programmable logic and visualization by the integrated processors. The platform significantly reduces data volume converting raw data to a list-mode representation, while generating visualization on the fly. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.10754v1-abstract-full').style.display = 'none'; document.getElementById('1807.10754v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">IEEE Transactions on Medical Imaging, 17 May 2018</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.11696">arXiv:1805.11696</a> <span> [<a href="https://arxiv.org/pdf/1805.11696">pdf</a>, <a href="https://arxiv.org/format/1805.11696">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6560/aafe20">10.1088/1361-6560/aafe20 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Feasibility study of the positronium imaging with the J-PET tomograph </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moskal%2C+P">P. Moskal</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B">B. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Sz. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pa%C5%82ka%2C+M">M. Pa艂ka</a>, <a href="/search/physics?searchtype=author&query=Pawlik-Nied%C5%BAwiecka%2C+M">M. Pawlik-Nied藕wiecka</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">L. Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Raj%2C+J">J. Raj</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Shivani"> Shivani</a>, <a href="/search/physics?searchtype=author&query=Shopa%2C+R+Y">R. Y. Shopa</a> , et al. (5 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1805.11696v3-abstract-short" style="display: inline;"> A detection system of the conventional PET tomograph is set-up to record data from e+ e- annihilation into two photons with energy of 511 keV, and it gives information on the density distribution of a radiopharmaceutical in the body of the object. In this paper we explore the possibility of performing the three gamma photons imaging based on ortho-positronium annihilation, as well as the possibili… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.11696v3-abstract-full').style.display = 'inline'; document.getElementById('1805.11696v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.11696v3-abstract-full" style="display: none;"> A detection system of the conventional PET tomograph is set-up to record data from e+ e- annihilation into two photons with energy of 511 keV, and it gives information on the density distribution of a radiopharmaceutical in the body of the object. In this paper we explore the possibility of performing the three gamma photons imaging based on ortho-positronium annihilation, as well as the possibility of positronium mean lifetime imaging with the J-PET tomograph constructed from plastic scintillators. For this purposes simulations of the ortho-positronium formation and its annihilation into three photons were performed taking into account distributions of photons' momenta as predicted by the theory of quantum electrodynamics and the response of the J-PET tomograph. In order to test the proposed ortho-positronium lifetime image reconstruction method, we concentrate on the decay of the ortho-positronium into three photons and applications of radiopharmaceuticals labeled with isotopes emitting a prompt gamma quantum. The proposed method of imaging is based on the determination of hit-times and hit-positions of registered photons which enables the reconstruction of the time and position of the annihilation point as well as the lifetime of the ortho-positronium on an event-by-event basis. We have simulated the production of the positronium in a cylindrical phantom composed of a set of different materials in which the ortho-positronium lifetime varied from 2.0 ns to 3.0 ns, as expected for ortho-positronium created in the human body. The presented reconstruction method for total-body J-PET like detector allows to achieve a mean lifetime resolution of about 40 ps. Recent Positron Annihilation Lifetime Spectroscopy measurements of cancerous and healthy uterine tissues show that this sensitivity may allow to study the morphological changes in cell structures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.11696v3-abstract-full').style.display = 'none'; document.getElementById('1805.11696v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted in PMB (http://iopscience.iop.org/article/10.1088/1361-6560/aafe20)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.07148">arXiv:1804.07148</a> <span> [<a href="https://arxiv.org/pdf/1804.07148">pdf</a>, <a href="https://arxiv.org/format/1804.07148">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Feasibility study of the time reversal symmetry tests in decays of metastable positronium atoms with the J-PET detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gajos%2C+A">A. Gajos</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/physics?searchtype=author&query=Dulski%2C+K">K. Dulski</a>, <a href="/search/physics?searchtype=author&query=Gorgol%2C+M">M. Gorgol</a>, <a href="/search/physics?searchtype=author&query=Gupta-Sharma%2C+N">N. Gupta-Sharma</a>, <a href="/search/physics?searchtype=author&query=Hiesmayr%2C+B+C">B. C. Hiesmayr</a>, <a href="/search/physics?searchtype=author&query=Jasi%C5%84ska%2C+B">B. Jasi艅ska</a>, <a href="/search/physics?searchtype=author&query=Kacprzak%2C+K">K. Kacprzak</a>, <a href="/search/physics?searchtype=author&query=Kap%C5%82on%2C+%C5%81">艁. Kap艂on</a>, <a href="/search/physics?searchtype=author&query=Kisielewska%2C+D">D. Kisielewska</a>, <a href="/search/physics?searchtype=author&query=Korcyl%2C+G">G. Korcyl</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+P">P. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kozik%2C+T">T. Kozik</a>, <a href="/search/physics?searchtype=author&query=Krzemie%C5%84%2C+W">W. Krzemie艅</a>, <a href="/search/physics?searchtype=author&query=Kubicz%2C+E">E. Kubicz</a>, <a href="/search/physics?searchtype=author&query=Mohammed%2C+M">M. Mohammed</a>, <a href="/search/physics?searchtype=author&query=Nied%C5%BAwiecki%2C+S">Sz. Nied藕wiecki</a>, <a href="/search/physics?searchtype=author&query=Pa%C5%82ka%2C+M">M. Pa艂ka</a>, <a href="/search/physics?searchtype=author&query=Pawlik-Nied%C5%BAwiecka%2C+M">M. Pawlik-Nied藕wiecka</a>, <a href="/search/physics?searchtype=author&query=Raczy%C5%84ski%2C+L">L. Raczy艅ski</a>, <a href="/search/physics?searchtype=author&query=Raj%2C+J">J. Raj</a>, <a href="/search/physics?searchtype=author&query=Rudy%2C+Z">Z. Rudy</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Shivani"> Shivani</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1804.07148v1-abstract-short" style="display: inline;"> This article reports on the feasibility of testing of the symmetry under reversal in time in a purely leptonic system constituted by positronium atoms using the J-PET detector. The present state of T symmetry tests is discussed with an emphasis on the scarcely explored sector of leptonic systems. Two possible strategies of searching for manifestations of T violation in non-vanishing angular correl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.07148v1-abstract-full').style.display = 'inline'; document.getElementById('1804.07148v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.07148v1-abstract-full" style="display: none;"> This article reports on the feasibility of testing of the symmetry under reversal in time in a purely leptonic system constituted by positronium atoms using the J-PET detector. The present state of T symmetry tests is discussed with an emphasis on the scarcely explored sector of leptonic systems. Two possible strategies of searching for manifestations of T violation in non-vanishing angular correlations of final state observables in the decays of metastable triplet states of positronium available with J-PET are proposed and discussed. Results of a pilot measurement with J-PET and assessment of its performance in reconstruction of three-photon decays are shown along with an analysis of its impact on the sensitivity of the detector for the determination of T -violation sensitive observables. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.07148v1-abstract-full').style.display = 'none'; document.getElementById('1804.07148v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 9 figures. Submitted to Advances in High Energy Physics</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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