Dose Course 2018_Flipping book

Dose per MU formalisms: factor-based dose calculations

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

3

REF

F

4

c

c

R

2

1

c

c

(

)

(

)

SAD dcD

d cD

; ,

,

( ) ( ) eqsq c eqsq 

(

) d s TPR cS sS

d

ref

ref

=





,

p

eqsq

M

M

The formalism above applies when the reference normalization conditions are isocentric (SSD ref =90cm and d ref =10cm) and scatter factors are determined isocentrically.