https://wiki.radiology.wisc.edu/index.php?title=Estimate_age_of_hemorrhage_-_MRI&feed=atom&action=history
Estimate age of hemorrhage - MRI - Revision history
2024-03-29T10:09:18Z
Revision history for this page on the wiki
MediaWiki 1.39.6
https://wiki.radiology.wisc.edu/index.php?title=Estimate_age_of_hemorrhage_-_MRI&diff=234&oldid=prev
Radadmin: Created page with "{| class="wikitable" |- ! Stage !! Biochemistry !! Location !! Property !! T1W !! T2W !! Mnemonic |- | Hyperacute (hrs) || oxy-Hb || intracellular || Dimagnetic || isointense..."
2018-10-31T19:44:51Z
<p>Created page with "{| class="wikitable" |- ! Stage !! Biochemistry !! Location !! Property !! T1W !! T2W !! Mnemonic |- | Hyperacute (hrs) || oxy-Hb || intracellular || Dimagnetic || isointense..."</p>
<p><b>New page</b></p><div>{| class="wikitable"<br />
|-<br />
! Stage !! Biochemistry !! Location !! Property !! T1W !! T2W !! Mnemonic<br />
|-<br />
| Hyperacute (hrs) || oxy-Hb || intracellular || Dimagnetic || isointense || <span style="color:red"> bright</span>|| IB<br />
|-<br />
|Acute (1-2 days) || deoxy-Hb||intracellular||paramagnetic||isointense||dark||ID<br />
|-<br />
|Early subacute (2-7 days)||Met-Hb||intracellular||paramagnetic||<span style="color:red">bright</span>||dark||BD<br />
|-<br />
|Late subacute (1-4 wks)||Met-Hb||extracellular||paramagnetic||<span style="color:red">bright</span>||<span style="color:red">bright</span>||BaBy<br />
|-<br />
|Chronic||Hemosiderin||extracellular||ferromagnetic||dark||dark rim||DooDoo<br />
|}<br />
<br />
<br />
* Appearance of intracranial hemorrhage on MR depends on the age of the hematoma and the sequence (Tl or T2 weighted). <br />
* As hematoma ages, hemoglobin passes through different forms (oxyhemoglobin à deoxyhemoglobin à methemoglobin) prior to red cell lysis and breakdown into hemosiderin.<br />
<br />
{| class="wikitable"<br />
|-<br />
!Mnemonic!!Stage!!T1!!T2<br />
|-<br />
|'''I'''t '''B'''e||Hyperacute||isointense '''(I)'''||hyperintense '''(B)'''<br />
|-<br />
|'''I'''d'''D'''y||Acute||iso to hypointense '''(I)'''||hypointense '''(D)'''<br />
|-<br />
|'''B'''i'''D'''dy||Early Subacute||hyperintense '''(B)'''||hypointense '''(D)'''<br />
|-<br />
|'''B'''a'''B'''y||Late Subacute||hyperintense '''(B)'''||hyperintense '''(B)'''<br />
|-<br />
|'''D'''oo '''D'''oo||Chronic||hypointense '''(D)'''||hypointense '''(D)'''<br />
|}</div>
Radadmin