1102-1103 / 2239
( )
(
)
( )
µ
Tracing the primary beam to release energy (for
later transport by point kernels)
Collision KERMA
(
the released energy to become primary dose
)
( )
( )
{
( )
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
µ
Ψ Ψ
−
∫
=
r
r
r
r
r
r
647448
123
Energy fluence
10
en
,
d
E
E
P
E
E
Ψ
ρ
=
∫
r
r
r
( )
(
)
( )
en
,
d
E
E
S
E
E
µ µ
Ψ
ρ
−
=
∫
r
r
r
SCERMA
(
the released energy to become scatter dose
)
r
TERMA=collision KERMA+SCERMA
The result for each ray is weigthed by the value of the energy
fluence bixel it passes
!