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Dose per MU formalisms:

factor-based dose calculations

Isocentric linac

reference

normalisation

geometry

• Step 1: account for differences in dose at the calculation point due to changes

in scatter conditions in the head of the linac

• Step 2: account for differences in phantom scatter due to the change in field

size (amount of phantom irradiated)

Step 3

:

account for differences in phantom scatter due to the change of depth

c

ref

d

ref

SAD

c

SAD

d

d

ref

c

SAD

c

ref

c

c

ref

c

ref

c

c

d

d

ref

d

ref