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Including monitor signal
M
b
caused by backscatter as a function of collimator aperture, the
formalism is:
(
)
(
)
( )
(
)
1
0
0
0
; , ;
; , ;
1
D A x y z D A x y
b A
M
z
M
−
=
+
Dose per MU formalisms:
model-based dose calculations
calibration
factor
Note: Different implementations in common TPSs described in the next lecture)
(
)
(
)
( )
(
)
calc
1
ref
o
ref
ref
ref
ref
meas
ref
ref
ref
ref
o
o
1
,
,
;
,
,
;
−
+
=
Ab
z y x AD
M z y x AD
M