Development of a Methodology for Measuring the Output Factor for Electron Blocks
DOI:
https://doi.org/10.15392/2319-0612.2024.2469Keywords:
Radiotherapy, electrons beams, output factor, EPID, PythonAbstract
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.
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