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1. I need to be efficient
Δr
1
1
2
Δr
Δr
2
2
D
[1 exp(
)]
1sc2 2
0
0
D1sc2 2
Δr
Δr
2
2
S { Δr [1 exp(
Δr )}
1sc,2
2
2
Δr2
dr
b r dr
b
b
B
b
b
− −
→
=
=
=
→
− −
−
θ
Averaging
dose over all points
along Δr2
in
voxel 2 :
Δr
2
Equations for the transport of scerma
generated at each point along a
transport line
Under the collapsed cone approximation:
•
Scerma does not vary with θ within ΔΩ
(Bθ, bθ constant along transport line)
and scerma generated, emitted and
absorbed along transport line
and assuming:
•
Scerma generated per unit r is constant
within the same voxel (scerma does not
vary considerably within voxels)