ESTRO 2023 - Abstract Book

S1736

Digital Posters

ESTRO 2023

proton beam was simulated on a water phantom and the kinetic energy distribution per voxel was scored, tracking only protons and heavier hadrons and excluding secondary electrons. LUTs were applied to each distribution, giving the overall ȳD, ȳF and y* for that voxel. As a second step, the same approach was repeated in a research version of the RayStation TPS(v11B IonPG), the LUTs were applied and, again, the obtained results were compared with the reference Geant4 simulation to validate the procedure in a TPS. Results A set of LUTs has been built for protons(Fig.1). Their validity has been tested using Geant4 and the results are in good agreement(Fig.2). The agreement between ȳD, ȳF and y* obtained by applying the LUTs to the Geant4-obtained kinetic energy distribution (blue) and those calculated directly from the microdosimetric spectrum using the reference Geant4 simulation(orange) is within 10% throughout the whole Bragg curve. The only exception are voxels in the entrance channel, whose much higher discrepancies are being investigated. Moreover, the LUTs method applied using RayStation(red) with a setup configuration similar to that implemented in Geant4 shows good agreement(Fig.2).