IMRT 2018
Kernel-based methods: Convolution/Superposition
Simplest possible situation: Monoenergetic incident photons, Homogeneous medium
Dose in point r…
( ) r
( ) (
)
3
D
s rhsTsd
=
−
primary photon source
… superposition of all point kernels originating around all possible points s
mathematically: 3D- convolution integral
→ very efficient numerical implementation via fast fourier transform! BUT necessary condition: point kernel independent of location (homogeneous medium)
s
r
ESTRO IMRT course 2017 Dose Calculation in Static and Rotational IMRT Madrid April 13th, 2017
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