Point dose measurements for brachytherapy with a cylinder applicator

Point dose measurements were conducted in High dose-rate (HDR) brachytherapy with a cylinder applicator using an EBT3 gafchromic film. The main objectives of this study were to determine the characteristics of an EBT3 film and evaluate the treatment dose of brachytherapy between manual and normalized measurements. Evaluation of the dose treatment was performed by comparing the dose values at four measurements (namely A1, A2, A3, and A4) points with the dose values after being normalized. The first two points A1 and A2 are the prescription points to the right and left of the cylinder applicator. The dose measurements at these two points were measured for three variations of distance (13, 14, and 15 mm) to the source of brachytherapy. The other two points, A3 and A4, are located at a distance of 1.5 cm above the two points, A2 and A1. The most suitable calibration for point dose measurements is the 13-mm distance, which results in the discrepancy values for points A1, A2, A3, and A4 are -0.37 %, -3.40 %, -1.39 %, and -1.54 %, respectively.