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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)
|