Title
Complementary use of <tex>$T_{2}$</tex>-weighted and postcontrast <tex>$T_{1}$</tex>-and <tex>$T2^{*}$</tex>-weighted imaging to distinguish sites of reversible and irreversible brain damage in focal ischemic lesions in rat brain Complementary use of <tex>$T_{2}$</tex>-weighted and postcontrast <tex>$T_{1}$</tex>-and <tex>$T2^{*}$</tex>-weighted imaging to distinguish sites of reversible and irreversible brain damage in focal ischemic lesions in rat brain
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences . Biomedical Sciences
Publication type
article
Publication
New York ,
Subject
Computer. Automation
Source (journal)
Magnetic resonance imaging. - New York
Volume/pages
13(1995) , p. 185-192
ISSN
0730-725X
ISI
A1995QH14400002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The evolution of a photochemically induced cortical infarct was monitored using T-2-, postcontrast (GdDOTA) T-1-, and postcontrast (DyDTPA-BMA) T-2*-weighted NMR imaging techniques. Data acquired with these different NMR imaging types were compared, both qualitatively and quantitatively. The T-2*-weighted NMR images after sprodiamide injection (DyDTPA-BMA) were perfusion-weighted images that allowed the differentiation between several infarct-related areas in terms of different degrees of perfusion deficiency. No quantitative information on cerebral blood flow (CBF) was obtained. A clear distinction was made between areas with a complete lack of CBF located in the core of the lesion and temporary CBF insufficiencies in the rim surrounding this core. Concomitant observations on T-2-weighted and postcontrast T-1-weighted images revealed the same temporary rim characterized by an increased water content, and an intact blood-brain barrier (BBB), as well as by reduced perfusion. This rim appeared within the first hours after infarct induction, reached a maximum 24 h later, and lasted between 3-5 days, when its size gradually decreased until complete disappearance. These observations suggest the existence of an area at risk. Only on postcontrast T-1-weighted images, the core of the lesion remained visible during the whole experimental period (10 days) and reflected in all likelihood the irreversibly damaged ischemic central core. The combined application of different NMR imaging techniques when studying focal cerebral infarctions in the rat brain allowed us to distinguish, in terms of NMR characteristics, zones of reversible from irreversible brain damage and to estimate the severity of the damage. This might offer an appropriate experimental setup for the screening of cerebroprotective compounds.
E-info
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