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TPS modelling/tests
Varian Eclipse:
”Physical jaws are assumed to have zero transmission, except for Elekta virtual wedge
calculation,for which jaw transmission needs to be defined in Beam Configuration”
2-3 papers claim the
system underestimates peripheral dose due to neglecting leakage
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
source grid point down through the treatment head to the “dose” point”
but there are no published
tests.
Xio: one paper states ”too simple beam model”
Pinnacle: underestimated collimator scatter near field edge
Other systems: ?