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Start Over Topic computed tomography Journal radiation measurements
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1. A novel dosimetry system for computed tomography using phototransistor

Author

Magalhães, C.M.S., Sobrinho, M.L., Souza, D.N., Filho, J. Antônio, da Silva, E.F., and Santos, L.A.P.

Subjects
*TOMOGRAPHY, *RADIATION dosimetry, *PHOTOTRANSISTORS, *IONIZATION chambers, *DETECTORS, *PHYSICS experiments, *ESTIMATES, *QUALITY control
Abstract

Abstract: Computed tomography (CT) dosimetry normally uses an ionization chamber 100mm 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 100mm pencil chamber. The angular response showed that the one device detector configuration is the most adequate among the three configurations analyzed in this study. [Copyright &y& Elsevier]

Published
2012
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2. ICRP and radiation protection of medical staff

Author

Eliseo Vano

Subjects
medicine.medical_specialty, Radiation, Medical staff, medicine.diagnostic_test, business.industry, Radiation dose, Computed tomography, Interventional radiology, Digital radiology, Radiological weapon, medicine, Medical physics, Radiation protection, business, Instrumentation
Abstract

Committee 3 (Protection in Medicine) and Committee 4 (Application of Recommendations) of the International Commission on Radiological Protection (ICRP) deal with the protection of medical staff. In the last 10 years, the Committee on Protection in Medicine has been involved in the preparation of 12 publications, some of which include specific recommendations on occupational RP. This paper summarizes the most relevant aspects of these recommendations on RP for medical staff. The most recent publication on Radiation Dose to Patients from Radiopharmaceuticals contains an annex on hand exposure in radio-pharmacies. Radiation detriment from exposure of both radiological staff and other individuals is considered as part of the justification of medical exposures and of the optimization process. ICRP advises on the uncertainty concerning the risk of cataracts and puts particular emphasis on optimization in situations of exposure of the eyes. Some recommendations on staff protection are included in the documents on computed tomography, digital radiology, pregnancy, discharge of patients after therapy and interventional radiology. The contents related to staff RP in the coming publications of the Committee (pediatric, cardiology, and fluoroscopy) are also summarized.

Published
2011
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