IMRT Course 2016

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Kernel-based methods:

Convolution/Superposition

( )

( ) (

)

∫

−

=

s rhsTsd rD

r r r

r

3

…

superposition

of all point kernels originating

around all possible points

s

primary photon source

Dose in point

r…

Simplest possible situation:

Monoenergetic incident photons,

Homogeneous medium

ESTRO IMRT course 2016

Dose Calculation in Static and Rotational IMRT

London April 7th, 2016

-28-

mathematically: 3D-

convolution integral

→

very efficient numerical implementation via

fast fourier transform!

BUT necessary condition: point kernel

independent of location (homogeneous

medium)

r

s