1078 / 1359
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
)