Advanced Physics for Brachytherapy 2018

1. I need to be efficient

Our oversimplified example on a plane (one array of voxels or one image):

scerma does not vary with θ within ΔΩ → less fitting for B θ , b θ

BUT

I still need to evaluate D i->j different radial distance

for all points j at

•

OR

I could evaluate D

only for j at exactly θ 0

, φ

•

i->j

0

Hence each cone defined by ΔΩ is collapsed to its main axis and scerma from each point is transported along lines defined by the directions from volume discretization in ΔΩ (order of evaluations required~MN 4 )