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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
µ
P
is experimentally accessible, variation
of the other raytracing parameters can be correlated to
µ
P
, see MedPhys, Vol32, pp1722-37.
Medical Physics,
(5): p. 662-667
( )
( )
( )
( )
P
P
0
:
0
HVL
HVL
µ δ
δ µ
=
Handling the beam spectrum – offaxis changes
12
Tailor, R.C.,
et al.
1998.
25
Heterogeneities considered by using different sets of parameters
for each tissue type, mapped by using tissue lookup tables from
the Hounsfield numbers!