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Ray tracing
The term “Ray tracing” is frequently used to determine the
radiological path length through a voxel array (with
densities
ρ
11
,
ρ
12
,
ρ
13
, …).
d
geo
is the geometrical path
within the patient:
µ⋅
Φ=Φ
radiol
-r
0
e
ρ
11
ρ
12
ρ
13
ρ
21
ρ
22
ρ
23
ρ
31
ρ
32
ρ
33
d
geo
d
1
d
2
d
3
d
4
d
5
d
radiol
is the radiological path
within the patient (simplified):
22
∑
=
⋅ =
N
1i
i i
radiol
ρd
ρ
1
d