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Dose per MU formalism:
Elekta Oncentra MasterPlan
Including monitor signal
M
b
caused by backscatter depending on collimator setting
(
)
(
)
( )
(
)
0
0
1
0
; ,
, ;
;
1
;
D A x y
D A x y
z
z
M
A
M
b
−
=
+
(
)
(
)
(
)
( )
(
)
ref
ref
ref
ref
Meas
1
ref
ref
ref
ref
0
ref
Calc
0
0
; ,
,
;
,
,
1
D A x y z M
D A
x y
z
b
M
A
−
=
+
Includes head
scatter and
phantom
scatter
M
0
M
b
Monitor chamber
mon
z
coll
z
( )
2
mon
back
2
coll
z
b A k F
z
=
(
)
3
2
Irradiated
coll
mon
collimator
area
cos
d
F
A
z
z
=
−
Empirical factor from
S
c
measurements
(
)
presc
; at prescription point/conditions from field
i
i
i
D w
M
D A
i
M
=
(
)
(
)
all fields
=1
;prescription conditions
;prescription conditions
i
i
i
i
D A
w
D A
=