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Dose per MU formalisms: factor-based dose calculations
Isocentric formalism: dose per meterset NOT at isocentre (on CAX)
Scaling energy fluence from
(
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(
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( ) (
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(
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2
eqsq d,
eqsq ,
p
eqsq
c
ref
ref
d
,
,
; ,
+
⋅
⋅
⋅
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=
d SSD
SAD
d s TPR
sS cS
M
d cD
M
SSD dsD
d
that at isocentre to that at the
calculation point not at SAD
On the assumption that phantom
scatter ratios are independent of
SSD
The field size used is that at the
calculation point