Optimization of Efficiency on DOSXYZnrc Monte Carlo Code Parameters for a 12 MV Photon Beam

Monte Carlo calculations consume more times, which made it prohibitive for routine clinical utilization. Several parameters, such as photon splitting, Boundary Crossing Algorithms and range rejection are included in the DOSXYZnrc Monte Carlo code to significantly optimize the efficiency of particles radiation beams transport in radiotherapy by reducing the computation time and uncertainties. In this study, the Monte Carlo DOSXYZnrc code used to compute the dose efficiency. In this study, we used the phase space files of Saturne 43 medical linear accelerator geometry generated by the BEAMnrc code, as an input source on DOSXYZnrc Monte Carlo code. Thus, in this work we changed and used various optimized parameters implemented on DOSXYZnrc code to importantly increase the efficiency during the computation of the dose distributions on a homogeneous cubic water phantom. The most optimized efficiency achieved to the factor of 4.56 for depth dose performed in a homogeneous water phantom when photon splitting, range rejection and HOWFARLESS are all optimized and combined on DOSXYZnrc code. The performance of DOSXYZnrc Monte Carlo code depends on the details of the parameters optimized by the model used. So, a relative efficiency improvement due to optimization of DOSXYZnrc parameters on 10 × 10 cm ² field size.