Estimate age of hemorrhage - MRI
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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) |