| Classification | T1 | T2 | Notes |
| Hyperacute (0 – 1 day) | Isointense | Bright | Oxyhemoglobin |
| Acute (1 – 3 days) | Isointense | Dark | Deoxyhemoglobin |
| Early Subacute (4 – 7 days) | Bright | Dark | Methemoglobin |
| Late Subacute (>7 days) | Bright | Bright | Extracellular Methemoglobin |
| Chronic (>2 weeks) | Dark | Dark | Hemosiderin |
References:
Bradley, W. G., Jr. (1993). “MR appearance of hemorrhage in the brain.” Radiology 189(1): 15-26.