Simulation of beam record data for 4D dose calculation

Treatment of moving targets can result in local over and under dosage due to interference effects of the beam application and the motion of the target. First experimental studies [1] as well as theoretical works [2, 3] showed that multiple irradiations with an accordingly reduced dose per irradiation reduce these inhomogeneities due to averaging effects. If the multiple irradiations are performed within one fraction this method is called rescanning. We build up a simulation environment based on TRiP4D [4] to compare different motion mitigation methods. Input to 4D dose calculations are simulated beam records. In this work, we present a tool which allows simulating the beam progression data of the beam records, i.e. the irradiation time of each beam position (referred to as rasterpoint).