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Fig. 1 | Radiation Oncology

Fig. 1

From: Adaptive step size algorithm to increase efficiency of proton macro Monte Carlo dose calculation

Fig. 1

Schematic illustration of the proton MMC transport. A primary proton of certain energy is entering the voxelized geometry from the right. Top: With the adaptive pMMC, a slab of adequate size depending on energy and local environment of the proton is chosen and macro step parameters are sampled from the pre-simulated database. Smaller slabs are chosen for low proton energy and close proximity to material interfaces, larger slabs are chosen for a proton traversing a homogeneous environment. Bottom: With the non-adaptive pMMC, the macro step size in the patient is restricted by the voxel size in proton direction

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