Fig. 3From: Adaptive step size algorithm to increase efficiency of proton macro Monte Carlo dose calculationProton track through a macro step. Left: Illustration of a possible realistic proton trajectory and the approximation as a direct and hinge step. Right: Qualitative trend of the proton stopping power and the used approximation for dose deposition in the pMMC method. Over the distance of the proton track, multiple voxels of varying HU values can be crossed in oblique angles, yielding different cutting lengths of proton track and voxels i=1,…,nBack to article page