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Th th d i
d !
e me o … s rea y
(and it’s convolution/superposition)
•
I can calculate D
1sc
@ any point from any
point, e.g.:
1
1
i
θ
r -r
dVθ) ir-jrh(
1sc i
S iρ
θ),ir-jrh( dV iρ
1sc,i
S
jρ
jh 1sc,i
R
jρ
=
1scD
j i
j i
j
,
,
jρ
and the total dose to j would be:
V
dVjh
1sc,i
S
jρ
iρ = 1scD
j
BUT…:
1 I need to be efficient
(reduce the # of the N
6
evaluations required)
& work
.
with finite voxels
2. I need to account for inhomogeneities
3. I need to account for higher order of scatter (D
2sc
, D
3sc
, …, D
msc
)
4. I need to work with real sources
5. I need to account for finite patient dimensions