Dose 2016

Approximations in dose calculation

Heterogeneous media: kernel scaling

ρ 0 ρ 1

ρ 1 illustrates a low density region, e.g. lung tissue.

z eq

Primary depositio n volume

Calculatio n point

Heterogeneous slab phantom

ρ 1

z eq

z

z

ρ 1

ρ 0

ρ 0

ρ 0

ρ 1

Primary depositio n volume

Primary depositio n volume

Primary depositio n volume

Calculatio n point

Calculatio n point

Calculatio n point

Scatter underestimated

Scatter and primary overestimated

Scatter overestimated