Dose 2016

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 , …). µ⋅

Φ=Φ radiol -r 0 e

d

is the geometrical path

geo

within the patient:

d

d is the radiological path within the patient (simplified): radiol

geo

d

1

ρ

ρ

ρ

11

12

13

d

2

d

ρ

ρ

ρ

3

21

22

23

ρ 1

d

N

4

∑

d

ρd

ρ

ρ

ρ

d

⋅ =

radiol

i i

5

31

32

33

1i

=

22