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Effect of spectral changing with lateral position can be modelled by lateral variation of the
energy release parameters. The offaxis variation of
P
is experimentally accessible, variation
of the other raytracing parameters can be correlated to
P
, see MedPhys, Vol32, pp1722-37.
Tailor, R.C.,
et al.
Medical Physics,
1998.
25
(5): p. 662-667
P
P
0
:
0
HVL
HVL
Heterogeneities considered by using different sets of parameters
for each tissue type, mapped by using tissue lookup tables from
the Hounsfield numbers!
Handling the beam spectrum – offaxis changes