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ESTRO IMRT course 2015
Dose Calculation in Static and Rotational IMRT
Brussels October 8th, 2015
-28-
Kernel-based methods:
Convolution/Superposition
( )
( ) (
)
∫
−
=
s rhsTsd rD
3
…
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)
primary photon source
r
s
Dose in point
r…
Simplest possible situation:
Monoenergetic incident photons,
Homogeneous medium