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Depth (cm)
a
z
b
z
The profiles change smoothly as
functions of
a
z
and
b
z
and hence
are suitable for interpolation with
a
z
and
b
z
as interpolation
variables!
calculation techniques:
Depth invariant (almost) shape relative dose profile – use for
interpolation to save convolutions?
Profiles
correspond to
different
b
z
Primary
Scatter
Primary dose profiles for a 10x10 cm field at 1, 3, 5 and 10 cm depths
Scatter dose profiles at 5, 10, 15 and 20 cm depths
( )
primary dose scatter dose
e
e
,
z
z
a r
b r
z
z
A
B
p r z
r
r
−
−
=
+
Parameterization reminder: