Advanced Physics for Brachytherapy 2018
2. inhomogeneities
The method inherently accounts for inhomogeneities assuming material properties are constant within each computational element (!!! restriction on computational element size !!!) through: • μ t,g , μ s,l,g • primary fluence ray tracing • dose calculation
)(
)(
)(
)(
G
P
G
P
1
1
water
= )( rD
D
r
r
)( r unc
r coll
r
r unc
r coll
+ g
(
)
=
)( ,
+ g
gen
gp
gen
gp
,
,
,
r
)( g
water
p
g
p
=
1
=
1
=
1
=
1
(note that D is calculated as a post processing operation)
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