Physics Bucharest 2017

Input Particles

 Modelling of radiation source consists of sampling the required information about initial particles ( type of particle , starting coordinates, direction cosines, energy , charge and particle weight )  The linac can be divided into:  Upper part - components that remain fixed for all possible beams settings (Patient independent)  Lower part - beam modifiers (Patient dependent)  The upper part is modeled only once and a phase-space file is generated at the entrance of the lower part  This file is then used as an input for the MCTP calculation (the lower part and the patient are handled in one process)