Aging Haemorrhage on MRI
2017-04-06
|hyperacute: intracellular oxyhaemoglobin
- isointense on T1
- isointense to hyperintense on T2
acute (1 to 2 days)
- intracellular deoxyhaemoglobin
- T2 signal intensity drops (T2 shortening)
- T1 remains intermediate-to-low
early subacute (2 to 7 days)
- intracellular methaemoglobin
- T1 signal gradually increases (T1 shortening) to become hyperintense
late subacute (7 to 14-28 days)
- extracellular methaemoglobin: over the next few weeks, as cells break down, extracellular methaemoglobin leads to an increase in T2 signal
chronic (>14-28 days)
- periphery
- intracellular haemosiderin
- low on both T1 and T2
- center
- extracellular hemichromes
- isointense on T1, hyperintense on T2