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10
en
,
d
E
E
P
E
E
r
r
r
en
,
d
E
E
S
E
E
r
r
r
Tracing the primary beam to release energy (for
later transport by point kernels)
Collision KERMA
(
the released energy to become primary dose
)
SCERMA
(
the released energy to become scatter dose
)
r
0
Raytrace integral
through CT-matrix
2
d
0
0
Incident
Inverse square
modulated and
collimated
energy fluence
e
l
l
l l
E
E
r
r
r
r
r
r
Energy fluence
TERMA=collision KERMA+SCERMA
The result for each ray is weigthed by the value of the energy
fluence bixel it passes
!