pGPUMCD: an efficient GPU-based Monte Carlo code for accurate proton dose calculations.

pGPUMCD: an efficient GPU-based Monte Carlo code for accurate proton dose calculations. Phys Med Biol. 2019 Mar 07;: Authors: Maneval D, Ozell B, Després P Abstract In proton therapy, Monte Carlo simulations are desirable to accurately predict the delivered dose. This paper introduces and benchmarks pGPUMCD, a GPU-based Monte Carlo code implementing the physical processes required for protontherapy applications. In pGPUMCD, the proton transport is carried out in a voxelized geometry with a class II condensed history scheme. For this purpose, the equivalent restricted stopping power formalism (L<sub>eq</sub> formalism), the Fermi-Eyges scattering theory and the discrete electromagnetic/nuclear interactions were considered. pGPUMCD was compared to Geant4 in a validation study where the physical processes were validated one after the other. Dose differences between pGPUMCD and Geant4 were smaller than 1% in the Bragg peak region and up to 3% in its distal fall-off. Moreover, a voxelwise dose difference below 1% was observed for 99.5% of calculation positions. The pGPUMCD 80% falloff positions matched with those of Geant4 within 0.1%. The pGPUMCD computation times were inversely proportional to the voxel size, with one million protons transported in less than 0.5 seconds with 1×1×1 mm<sup>3</sup> voxels. pGPUMCD, based on the L<sub>eq</sub> formalism v...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research