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Dose per MU formalisms: factor-based dose calculations
Isocentric formalism: dose per meterset at isocentre (at SAD and on CAX)
REF
F
3
4
c
c
c
c
R
1
2
(
)
(
)
( ) ( )
(
)
d cD SAD dcD
,
; ,
d c TPR cS cS
M
M
,
eqsq
eqsq
c
eqsq
p
ref
ref
d
⋅
⋅
⋅
=
The formalism above applies when the reference normalization conditions are
isocentric (SSD
ref
=90cm and d
ref
=10cm) and scatter factors are determined
isocentrically.