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1. I need to be efficient

Implementation corrections:

S

1sc

does not vary with θ within ΔΩ (Bθ,

θ

bθ constant along transport line)

bθ evaluated recursively as a moving

average of previous and current step

1

θ

2

S

1sc

generated per unit r is constant

within the same voxel (scerma does not

θ

3

vary considerably within voxels)

in high scerma gradient regions scerma is

estimated piecewise from a log linear

-

interpolation over r