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•
be simple enough so one can understand the behaviour of the
model
•
have a small number of free parameters
•
enable model parameters to be determined from manageable data
sources of measurements (output factors, profiles or depth dose
curves in water and air) and geometry (linac head design)
•
be complex enough to confirm all measurements in agreement
with the accuracy demands
A feasible energy fluence engine should
(adapted from Fippel
et al.
MedPhys(30)2003: 301-311):