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Dose per MU formalisms: factor-based dose calculations

Isocentric formalism: dose per meterset at isocentre (at SAD and on CAX)

c

c

c

c

REF

R

F

1

2

3

4

   

d s TPR cS s

S

M

d cD

M

SAD dcD

,

,

; ,

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.