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Approximations in dose calculation
Heterogeneous media: kernel scaling
Calculatio
n point
Primary
depositio
n volume
z
eq
ρ
0
ρ
1
ρ
1
illustrates a low
density region, e.g. lung
tissue.
Calculatio
n point
Primary
depositio
n volume
z
ρ
0
ρ
1
Scatter overestimated
Calculatio
n point
Primary
depositio
n volume
z
ρ
0
ρ
1
Scatter and primary
overestimated
Scatter underestimated
Calculatio
n point
Primary
depositio
n volume
z
eq
ρ
0
ρ
1
Heterogeneous
slab phantom