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Kernel-based methods:
Energy deposition
point kernel
6 MeV
Photon
The
point kernel
- also called
point spread
function
(PSF)- summarizes energy
deposition of all physical interaction
processes:
• pre-calculation e.g. with Monte Carlo
dose calculation in water
s
ESTRO IMRT course 2016
Dose Calculation in Static and Rotational IMRT
London April 7th, 2016
-27-
• parameterization for efficient use
(
)
(
)
s rE h srE h
water
water
r r
rr
−
=
,
, ,
homogeneous medium (water)
→
symmetrical PSF!
r