| T1-weighted spin-echo (representing the sum of in-phase signals of fat and water) | STIR (enhances the difference in longitudinal relaxation of fat and water) | Chemical shift imaging (out-of-phase images visualizing the absolute difference between water and fat signals) |
---|---|---|---|
Fat | High | Low | High |
Water | Low | High | High |
Cellular marrow (≈ 40% fat, 40% water, 20% protein) | Intermediate (higher than muscle) | Intermediate (higher than muscle) | Low |
Fatty marrow (≈ 80% fat, 15% water, 5% protein) | High | Low | High |
Fibrosis | Low | Low | Low |