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Analytical Methods for Photon Beam Calculation
Early
methods of dose calculation
Based on
separating
the dose into
primary
and
scatter
component
using empirical methods (e.g.
Clarkson
scatter integration)
Inhomogeneities
were corrected by
scaling
the fluence/
dose
with
density
(Equivalent Path Length method, Ray Tracing ...)
Works well if electron transport and effect of inhomogeneities on
scatter component can be ignored