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A simple schematic for the GPU-based MC tool developed in this study. The photons are generated at the source and filtered with a scanner-specific bowtie filter using a probability matrix defining the post-bowtie irradiation field. In case of TCM, the number of photons generated at the source is modulated according to the attenuation profile of the phantom. The photons are then tracked through the phantom to obtain an estimate for the dose absorbed in each voxel.
