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Earlier methods:
based on separating the dose into
primary and scatter
component using empirical methods
Works well if electron transport and effect of
inhomogeneities on scatter component can be ignored
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Mid 80s:
3D superposition of point spread function (PSF)
or ‘kernel’ in water were introduced
Extremely slow computationally and inhomogeneities
treated only approximately by “kernel scaling” along
rayline.
Analytical methods, photon beam calculation