Monte Carlo Simulation of a 6 MV X‑Ray Beam for Open and Wedge Radiation Fields, Using GATE Code

The aim of this study is to provide a control software system, based on monte carlo simulation, and calculations of dosimetricparameters of standard and wedge radiation fields, using a monte carlo method. gate version 6.1 (opengate collaboration), wasused to simulate a compact 6 mv linear accelerator system. in order to accelerate the calculations, the phase space technique andcluster computing (condor version 7.2.4, condor team, university of wisconsin madison) were used. dosimetric parameters used intreatment planning systems for the standard and wedge radiation fields (10 cm × 10 cm to 30 cm × 30 cm and a 60° wedge), includingthe percentage depth dose and dose profiles, were measured by both computational and experimental methods. gamma index wasapplied to compare calculated and measured results with 3%/3 mm criteria. gamma index was applied to compare calculated andmeasured results. almost all calculated data points have satisfied gamma index criteria of 3% to 3 mm. based on the good agreementbetween calculated and measured results obtained for various radiation fields in this study, gate may be used as a useful tool forquality control or pretreatment verification procedures in radiotherapy.