Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
|
Hyperacute blood on MRI
|
Less than 6 hours
predominant oxyhemoglobin will produce T1 and and T2 prolongation - dark on T1 and bright on T2 |
|
|
Acute blood on MRI
|
6 to 24 hours
predominant deoxyhemoglobin mild T1 prolongation (dark on T1) and moderate T2 shortening (darker on T2) |
|
|
Subacute blood on MRI
(3-4 days) |
Methemoglobin (intracellular)
T1 and T2 shortening (brigth on T1 and dark on T2) |
|
|
Subacute blood on MRI
1 week |
Extra cellular methemoglobin
T1 shortening and T2 prolongation ( bright on T1 and T2) |
|
|
Chronic Hemorrhage on MRI
|
Hemosiderin
produces extrreme T2 shortening (dark on T1 and T2) |
|
|
Acute blood on CT
|
Less than one week
increased attenuation |
|
|
Blood on CT after 1 to 3 weeks
|
Isodense to brain parenchyma
|
|
|
Blood on CT after 3 weeks
|
hypodense to brain parenchyma - simulating CSF attenuation.
|
