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mid

ij

primary

ij

ref

reconst

ij

reconst

ij

K

T SPR

d

d Sc





)

( Pr

)

(

Scatter to primary ratio:

Depends on the depth

Scatter Kernel (accounts for field size dependence)

Need to know

the Primary

Dose to the

EPID

EPID

calibration +

modelling

8-11 h

measurements

2h modelling

Per linac, per

beam

patient: How does the algorithm

work?

D

i,j

d

reconst

D

EPID

i,j

Primary Dose

Scatter Dose

D

i,j

(d

reconst

) = Pr

ij

(d

reconst

)+ Sc

ij

(d

reconst

)