TY - JFULL AU - C. M. M. Paschoal and M. L. Sobrinho and D. do N. Souza and J. Ant么nio Filho and L. A. P. Santos PY - 2011/9/ TI - A Novel Dosimetry System for Computed Tomography using Phototransistor T2 - International Journal of Biomedical and Biological Engineering SP - 326 EP - 330 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/1515 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 56, 2011 N2 - Computed tomography (CT) dosimetry normally uses an ionization chamber 100 mm long to estimate the computed tomography dose index (CTDI), however some reports have already indicated that small devices could replace the long ion chamber to improve quality assurance procedures in CT dosimetry. This paper presents a novel dosimetry system based in a commercial phototransistor evaluated for CT dosimetry. Three detector configurations were developed for this system: with a single, two and four devices. Dose profile measurements were obtained with them and their angular response were evaluated. The results showed that the novel dosimetry system with the phototransistor could be an alternative for CT dosimetry. It allows to obtain the CT dose profile in details and also to estimate the CTDI in longer length than the 100 mm pencil chamber. The angular response showed that the one device detector configuration is the most adequate among the three configurations analyzed in this study. ER -