Dose Course 2018_Flipping book

TPS modelling/tests

Varian Eclipse: ”Physical jaws are assumed to have zero transmission, except for Elekta virtual wedge 2-3 papers claim the system underestimates peripheral dose due to neglecting leakage calculation,for which jaw transmission needs to be defined in Beam Configuration”

Oncentra: very detailed approach - ”…direct fluence is obtained by modulating the open beam fluence with the attenuation from the different elements of the treatment head…. ray trace is performed from each beam

but there are no published

source grid point down through the treatment head to the “dose” point”

tests.

Xio: one paper states ”too simple beam model” Pinnacle: underestimated collimator scatter near field edge

Other systems: ?