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Brain Hematoma (hemorrhage), Blood MR Signal Intensity Change Evolution

Smirniotopoulos, M.D. JGSM - MedPix (2000)

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Affiliation: Uniformed Services University

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The evolution of these signal changes on T1W and T2W MR can be summarized by: IdDy BiDdy BeeBee DeeDee (ID,BD,BB,DD) or with the newer mnemonic below... • IdDy - Hyperacute (4-6 hrs) - II to ID (T1/T2) • BiDdy - Acute (7-72hrs) - BD (T1/T2) • Bee Bee (BaBy) - Subacute (1-4 wks) - BB (T1/T2) As a hematoma ages, the hemoglobin passes through several forms (oxyhemoglobin, deoxyhemoglobin, and methemoglobin) prior to red cell lysis and breakdown into ferritin and hemosiderin... • chronic (ferritin and hemosiderin, short T2)... The short T1 of methemoglobin is due to the paramagnetic dipole-dipole interaction... Another paramagnetic property, the magnetic susceptibility effect, is responsible for the short T2 observed when deoxyhemoglobin, methemoglobin, or hemosiderin is intracellular... T2 shortening can also be produced by hemoconcentration and clot retraction... The T2 shortening due to magnetic susceptibility effects is enhanced on higher-field-strength systems and on gradient-echo images and is reduced with "fast spin-echo" MR techniques... PMID: 8372185 [PubMed - indexed for MEDLINE]

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Here is a chart of the blood products, and their signal intensity on conventional T1W and T2W MR images.
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MPX2764_synpic35894: Here is a chart of the blood products, and their signal intensity on conventional T1W and T2W MR images.


Brain Hematoma (hemorrhage), Blood MR Signal Intensity Change Evolution

Smirniotopoulos, M.D. JGSM - MedPix (2000)

Here is a chart of the blood products, and their signal intensity on conventional T1W and T2W MR images.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=MPX2764&req=5

MPX2764_synpic35894: Here is a chart of the blood products, and their signal intensity on conventional T1W and T2W MR images.

View Article: MedPix Image - MedPix Topic

Affiliation: Uniformed Services University

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

The evolution of these signal changes on T1W and T2W MR can be summarized by: IdDy BiDdy BeeBee DeeDee (ID,BD,BB,DD) or with the newer mnemonic below... • IdDy - Hyperacute (4-6 hrs) - II to ID (T1/T2) • BiDdy - Acute (7-72hrs) - BD (T1/T2) • Bee Bee (BaBy) - Subacute (1-4 wks) - BB (T1/T2) As a hematoma ages, the hemoglobin passes through several forms (oxyhemoglobin, deoxyhemoglobin, and methemoglobin) prior to red cell lysis and breakdown into ferritin and hemosiderin... • chronic (ferritin and hemosiderin, short T2)... The short T1 of methemoglobin is due to the paramagnetic dipole-dipole interaction... Another paramagnetic property, the magnetic susceptibility effect, is responsible for the short T2 observed when deoxyhemoglobin, methemoglobin, or hemosiderin is intracellular... T2 shortening can also be produced by hemoconcentration and clot retraction... The T2 shortening due to magnetic susceptibility effects is enhanced on higher-field-strength systems and on gradient-echo images and is reduced with "fast spin-echo" MR techniques... PMID: 8372185 [PubMed - indexed for MEDLINE]

No MeSH data available.