Dose Course 2018_Flipping book

calculation techniques:

Charged particle contamination, separate modelling needed when pencil kernels are derived from MC simulations

4MV

24MV

Charged particle contamination kernel

The parameters  ,  , and  can be determined through fitting to the difference between measurements and calculated photon dose.

p

2

c

( ) ,

r z

− =

−

e e zr





A Ahnesjö and P Andreo (1989) Phys Med Biol 34 , 1451-64.