IMRT 2018

Kernel-based methods: 2D-superposition methods: Pencil Kernel algorithms

3D point kernel

pencil kernel

Integrate 3D point kernels along beam direction (‘pre-convolution’):

→ patient-specific local lateral scatter cannot be modelled well!

Dose calculation becomes a 2D-integration (superposition integral):









( )

( ) ( )  = s rp s s ,

2

D

d r



Fluence on the patient surface ( ) : s   ( ) : , sr p   Pencil Beam kernel

ESTRO IMRT course 2017 Dose Calculation in Static and Rotational IMRT Madrid April 13th, 2017

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