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M
zyx
A
D
M
zy
xAD
o
o
, , ;
, , ;
relates the MU to the incident direct
energy fluence under
reference
calibration conditions
calc
ref
ref
ref
ref
meas
ref
ref
ref
ref
o
,
,
;
,
,
;
o
z y x AD
M z
y
x AD
M
Energy fluence of
direct photons
at isocentre in air
M
D
meas
ref,
o
calc ref,
D
Calibration factor
Dose per MU formalisms:
model-based dose calculations