Determinação de doses equivalentes em diagnósticos médicos utilizando a técnica de PET/CT

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Luis C. B. Vargas
Jacó J. S. Costa
Jéssica A. Oliveira
Sérgio Gavazza
Cláudio L Oliveira
Domingos O Cardoso
Rudnei K Morales

Abstract

Positron emission tomography (PET/CT) is a nuclear medicine procedure used for medical diagnosis. In Brazil, This technique uses the positron emitter 18F-FDG (Fluorordesoxyglucose) as radiopharmaceutical which, if
annihilated, produces two gamma photons with energy of 0.511 MeV in the patient´s body, thus becoming a radiation source at the diagnosis facility. This study presents a calculation methodology for the exposure rates, exposure and weekly equivalent dose due to the ionizing radiation from the patient, at a point, as a function of the time and activity of the radiopharmaceutical administered to the patient. The calculations consider the interaction of gamma radiation in the human body and air, and the concept of collision kerma for radiation dosimetry. Finally, a spreadsheet is suggested to optimize the calculations developed depending on the operational characteristics of a PET/CT facility.

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How to Cite
Vargas, L. C. B., Costa, J. J. S., Oliveira, J. A., Gavazza, S., Oliveira, C. L., Cardoso, D. O., & Morales, R. K. (2019). Determinação de doses equivalentes em diagnósticos médicos utilizando a técnica de PET/CT. Revista Militar De Ciência E Tecnologia, 35(4). Retrieved from http://ebrevistas.eb.mil.br/CT/article/view/2812
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