Advanced Physics for Brachytherapy 2018

The MC method …

➢ Similar procedures (available in the literature from the 50’s) are used for sampling randomly from the probability distributions for every process involved in photon transport. ➢ MC is a statistical method to approximate dose at all points of a geometry ➢ The method inherently accounts for real sources, inhomogeneities, and phantom dimensions according to input data. ➢ The collision KERMA can be calculated within voxels by scoring the energy transferred to charged particles from interactions within the voxel and weighing by voxel mass (dm=ρdV) (analogue MC). ➢ Alternatively, photon energy fluence can be scored in each voxel and weighed by μen/ρ to obtain collision KERMA (track length estimator).