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Division of Nuclear Medicine SimSETNews - |
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| Last revised by: | |
| Revision date: |
29 Sept 2003 |
The method of modeling attenuation materials changed dramatically with verson 2.5. Some materials disappeared and some new ones were added. Old attenuation files will still run, but the materials they map to will probably be changed. The first seven materials are the exceptions.
The attenuation materials supported by the PHG and their respective default index values are as follows:
| air | 0 |
| water | 1 |
| blood | 2 |
| bone | 3 |
| brain | 4 |
| heart | 5 |
| lung | 6 |
| muscle | 7 |
| lead | 8 |
| Sodium Iodide | 9 |
| BGO | 10 |
| iron | 11 |
| graphite | 12 |
| tin | 13 |
| GI Tract | 14 |
| connective tissue | 15 |
| copper | 16 |
| perfect absorber | 17 |
| LSO | 18 |
| GSO | 19 |
| aluminum | 20 |
| tungsten | 21 |
| liver | 22 |
| fat | 23 |
| LaBr3 | 24 |
| low viscosity polycarb | 25 |
| NEMA polyethylene | 26 |
| polymethyl methylcrylate | 27 |
| polystyrene fibers | 28 |
For those users who wish to use the Zubal digital phantom, the list below shows the index translations we use. The comments to the side indicate what is referred to by Zubal and what we substitute (when necessary):
0 0 outside phantom -> air
1 15 skin -> connective tissue
2 4 brain -> brain
3 4 spinal cord -> brain
4 3 skull -> bone
5 3 spine -> bone
6 3 rib cage & sternum -> bone
7 3 pelvis -> bone
8 3 long bones -> bone
9 7 skeletal muscle -> muscle
10 6 lungs -> lung
11 5 heart -> heart
12 22 liver -> liver
13 1 gall bladder -> water
14 5 kidney -> heart
15 7 pharynx -> muscle
16 7 esophagus -> muscle
17 14 stomach -> GI tract
18 14 small bowel -> GI tract
19 14 colon -> GI tract
20 5 pancreas -> heart
21 1 adrenals -> water
22 23 fat -> fat
23 2 blood pool -> blood
24 0 gas (bowel) -> air
25 1 fluid (bowel) -> water
26 1 bone marrow -> water
27 7 lymph nodes -> muscle
28 7 thyroid -> muscle
29 15 trachea -> conn tissue
30 15 cartilage -> conn tissue
31 5 spleen -> heart
32 1 urine -> water
33 1 feces -> water
34 5 testes ->heart
35 5 prostate -> heart
36 0 unused
37 7 rectum -> muscle
38 0 unused
39 7 diaphragm -> muscle
40 7 bladder -> muscle
...63 7 lesion -> muscle
...
70 3 dens of axis -> bone
71 3 jaw bone -> bone
...
74 7 lacrimal glands -> muscle
75 7 spinal canal -> muscle
76 3 hard palate -> bone
77 4 cerebellum -> brain
78 7 tongue -> muscle
...
85 4 medulla oblongota -> brain
...
91 4 pons -> brain
...
99 3 incus(ear bones) -> bone
...
104 0 sinuses/mouth cavity -> air
...
106 4 optic nerve -> brain
...
113 7 cerebral falx -> muscle
...
119 1 eye -> water
...
121 1 lens -> water
122 1 cerebral aquaduct -> water
...
125 3 teeth - > bone