A Verification Method for Electron Beam Dose Calculations in Radiotherapy
Electron beam models of 9 MeV and 20 MeV were built in a commercial radiotherapy treatment planning system software RayStation. 14 test cases were created with RayStation, including 4 homogeneous water phantom test cases, 6 internal inhomogeneity test cases and 4 surface irregularity test cases, the dose distribution of electron beam plans were calculated in RayStation, and exported to perform gamma analysis with test dose distribution curves in the data set. According to comparison results of 14 test cases, gamma analysis results of the two-dimensional dose distribution were all over 95% by 3%/3mm criteria, and 99% by 5%/5mm criteria. From the results, RayStation Monte Carlo algorithm can accurately simulate and calculate the electron beam dose distribution.