Time | Substance | T1W | T2W
Hyperacute (< 12 hrs)
| oxy-Hb
| isointense
| hyperintense
| Acute (12 hrs - 3 days)
| deoxy-Hb
| isointense
| hypointense
| Early subacute (4 days - 1 wk)
| intracellular met-Hb
| hyperintense
| hypointense
| Late subacute (1 wk - 1 month)
| extracellular met-Hb
| hyperintense
| hyperintense
| Chronic (> 1 month)
| hemosiderin, ferritin
| hypointense
| hypointense
| |
DWI ↑
& ADC ↑
T1 ↑ | T1 ↓ | T1 ?
T2 ↑
| gad | EC met-Hb hemangioma water | metastasis oxy-Hb
| T2 ↓
| flow (AVM, aneurysm) | dural calcifn IC met-Hb cortical bone | fibrous tissue hemosiderin, ferritin deooxy-Hb
| T2 ?
| fat (lipoma, dermoid) | proteinaceous fld (colloid cyst, craniopharyngioma, Rathke's cleft cyst) melanin (melanoma) post pit hvy metals
|
| |