Tables
| T1 | T2 | Significance | |
|---|---|---|---|
| TYPE I | - | + | edema |
| TYPE II | + | +/- (or slight) | fatty degeneration |
| TYPE III | - | - | bony sclerosos |
| Substance | HU |
|---|---|
| Air | -1000 |
| Fat | -120 |
| Water | 0 |
| Blood | +30 to +45 |
| Muscle | +40 |
| Contrast | +130 |
| Bone | +400 or more |
| HU | |
|---|---|
| Lungs | -950 to -550 |
| Kidneys | +20 to +40 |
| Heart | +40 to +100 |
| Liver | +50 to +70 |
| Spongiose Bone | +50 to +200 |
| Compact bone | +250 to +1000 |
| Lesion Grade 0 | Lesion Grade 1 | Lesion Grade 2 | Lesion Grade 3 | Lesion Grade 4 |
|---|---|---|---|---|
| Normal meniscus | One or more signal changes point without continuity with the articular surface. (degenerative) | Linear signal change without extension to the articular surface. (degenerative+/-traumatic) | Change signal linear extension to the joint surface. (rupture) | Fragmentation, possible dislocation |
| AVM size | Adjacent eloquent cortex | Draining veins |
|---|---|---|
| Under 3 cm = 1 | Non-eloquent = 0 | Superficial only = 0 |
| 3-6 cm = 2 | Eloquent* = 1 | Deep veins = 1 |
| Over 6 cm = 3 |
