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Dose per MU formalisms:
factor-based dose calculations
Inhomogeneities
Primary photon path
Heterogeneities
Patient
Scattered particle path
Dose calculation point
( )
( )
( )
s
homogeneou
ous
heterogene
...
...
...
=
MU
D
CF
MU
D
Methods to account for inhomogeneities
in factor-based dose/MU calculations :
Either scale dosimetric parameters
appropriately
Or
Determine a correction factor as a
function of scaled dosimetric quantities