IMRT 2018

Kernel-based methods: Energy deposition point kernel

Photon

6 MeV

The point kernel - also called point spread function (PSF)- summarizes energy deposition of all physical interaction processes: • pre-calculation e.g. with Monte Carlo dose calculation in water • parameterization for efficient use

s

r



 

(

)

(

) s rE h srE h

water

water

, ,

=

,

−

homogeneous medium (water) → symmetrical PSF!

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

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