IMRT

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): ( ) ( ) ( ) ∫  , 2

Ψ = srps sd rD  

Fluence on the patient surface ( ) : s  Ψ ( ) : , srp  Pencil Beam kernel

ESTRO IMRT course 2015 Dose Calculation in Static and Rotational IMRT Brussels October 8th, 2015

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