Desenvolvimento de metodologia para medição do fator output para blocos de elétrons
Julia Martini Fontana, Maíra Ribeiro dos Santos · Brazilian Journal of Radiation Sciences · 2024
In light of the routine verification of output factor for electron blocks manufactured for patients and outside the standard square field measurements, this study proposes a methodology for measuring the output factor using EPID, validated by water measurements with a diode, and employing Python programming to analyze the pre-processed detector images. The study used square and rectangular blocks to validate the code and evaluate the limitations of the EPID, finding an agreement of up to ±3.0% for fields larger than 6.0 cm² and ±5.0% for fields between 3.0 cm² and 5.0 cm². The final evaluation aimed to compare square field measurements with asymmetric rectangular fields, and the results showed deviations of less than ±1.0%, thus indicating the feasibility of using EPID for this methodology.