IMRT 2018
Kernel-based methods: Energy deposition point kernel
Photon
6 MeV
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 • parameterization for efficient use
s
r
(
)
(
) s rE h srE h
water
water
, ,
=
,
−
homogeneous medium (water) → symmetrical PSF!
ESTRO IMRT course 2017 Dose Calculation in Static and Rotational IMRT Madrid April 13th, 2017
-28-
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