http://emedicine.medscape.com/article/344973-overview
| Phase | Time | Hemoglobin, Location | T1WI | T2WI |
| Hyperacute | <24h | Oxyhemoglobin, intracellular | isointense or hypointense | hyperintense |
| Acute | 1-3d | Deoxyhemoglobin, intracellular | hypointense | hypointense |
| Early subacute | >3d | Methemoglobin, intracellular | hyperintense | hypointense |
| Late subacute | >7d | Methemoglobin, extracellular | hyperintense | hyperintense |
| Chronic | >14d | Ferritin and hemosiderin, extracellular | hypointense | hypointense |
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