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Two lateral distributions sufficient for primary dose and
three for scatter dose. Only five convolutions per field!
1. Pre-calculate lateral dose distributions,
D
k
, for a selected set
of kernel parameters
a
z k
, where
k
=1..n
2. Runtime operations per calculation point:
• Calculate radiological depth
z
⇒
a
z
• Interpolate between lateral dose distributions,
D
k
and
D
k+1
1
1
1
2
k+1
2
(1 )
/
/
Inverse square factor
k
k
k
k
k
k
k
z
z
k
z
z
z
z
z
z
z
z
z
z
a a
D
A
D
D S
q
q
q
a
A a
A a
a a
S
calculation techniques:
interpolation scheme to save convolutions, example (primary dose):
This is the PK implementation in Oncentra