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A novel dosimetry system for computed tomography using phototransistor |
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| Authors: | C.M.S. Magalhã es,M.L. SobrinhoD.N. Souza,J. Antô nio FilhoE.F. da Silva Jr.,L.A.P. Santos |
| Affiliation: | a Departamento de Física, Universidade Federal de Sergipe, São Cristóvão-SE, Brazil b Centro Regional de Ciências Nucleares, Comissão Nacional de Energia Nuclear, Recife-PE, Brazil c Departamento de Energia Nuclear, Universidade Federal de Pernambuco, Recife-PE, Brazil d Departamento de Física, Universidade Federal de Pernambuco, Recife-PE, Brazil |
| Abstract: | 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 responses 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. |
| Keywords: | Computed tomography Dosimetry Phototransistor |
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