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Dose per MU formalisms:

factor-based dose calculations

Calculations at points off-axis (asymmetric fields)

(

)

(

)

( ) (

)

(

)

( )

2

eqsq d,

eqsq d,

eqsq

ref

ref

d

,

,

,

; , ,

+

=

d SSD

SAD

xd OAR d s TPR

sS cS

M

d cD

M

SSD xdsD

p

c

For off-axis positions up to 5cm

no significant variation from the values CAX

On-axis data used

Off-Axis Ratio: representing

off-axis variations of

primary fluence; different

approaches to determine

this experimentally