Estimate age of hemorrhage - MRI
Jump to navigation
Jump to search
| Stage | Biochemistry | Location | Property | T1W | T2W | Mnemonic |
|---|---|---|---|---|---|---|
| Hyperacute (hrs) | oxy-Hb | intracellular | Dimagnetic | isointense | bright | IB |
| Acute (1-2 days) | deoxy-Hb | intracellular | paramagnetic | isointense | dark | ID |
| Early subacute (2-7 days) | Met-Hb | intracellular | paramagnetic | bright | dark | BD |
| Late subacute (1-4 wks) | Met-Hb | extracellular | paramagnetic | bright | bright | BaBy |
| Chronic | Hemosiderin | extracellular | ferromagnetic | dark | dark rim | DooDoo |
- Appearance of intracranial hemorrhage on MR depends on the age of the hematoma and the sequence (Tl or T2 weighted).
- As hematoma ages, hemoglobin passes through different forms (oxyhemoglobin à deoxyhemoglobin à methemoglobin) prior to red cell lysis and breakdown into hemosiderin.
| Mnemonic | Stage | T1 | T2 |
|---|---|---|---|
| It Be | Hyperacute | isointense (I) | hyperintense (B) |
| IdDy | Acute | iso to hypointense (I) | hypointense (D) |
| BiDdy | Early Subacute | hyperintense (B) | hypointense (D) |
| BaBy | Late Subacute | hyperintense (B) | hyperintense (B) |
| Doo Doo | Chronic | hypointense (D) | hypointense (D) |