Document Detail


Single-coil arterial spin-tagging for estimating cerebral blood flow as viewed from the capillary: relative contributions of intra- and extravascular signal.
MedLine Citation:
PMID:  11550237     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The single-capillary model was applied to the exchange microvessels for water in the cerebral parenchyma and used to calculate blood-to-brain flux of water; the theory of the steady-state arterial spin-tagging (AST) technique for estimating cerebral blood flow (CBF) was revised to incorporate the presence of both extravascular (tissue) and capillary signal. A crucial element of the single-coil AST experiment is that magnetization transfer (MT) shortens the effective T1 of the extravascular water, making it one-quarter that of the T1 of capillary blood. Furthermore, the mean capillary transit time is on the order of the T1 of the extravascular water. The single-coil AST experiment is distinguished from other methods which use water as an indicator for measurement of CBF in that the (flow-dependent) populations of inverted protons in the intra- and extravascular compartments can be nearly equal for normal physiological conditions. The following questions are considered: Is single-coil AST contrast linear in resting CBF? Is contrast in the single-coil AST technique likely to be linear under changes in CBF in normal tissue? Is the contrast likely to be linear in such common pathologies as stroke and cerebral tumor? We demonstrate that, if the population of inverted protons in the microvessels is included in the experiment, the voxel population of inverted protons will be approximately linear with flow across a broad range of flow values. We predict that the single-coil AST experiment will systematically overestimate resting CBF for flows in the normal range, that changes in CBF in normal tissue will produce an approximately linear response in AST measurement, and, finally, we predict the operating characteristics of the measurement in common cerebral pathologies.
Authors:
J R Ewing; Y Cao; J Fenstermacher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine     Volume:  46     ISSN:  0740-3194     ISO Abbreviation:  Magn Reson Med     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-09-10     Completed Date:  2001-10-18     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  465-75     Citation Subset:  IM    
Copyright Information:
Copyright 2001 Wiley-Liss, Inc.
Affiliation:
Department of Neurology and Center for Stroke Research, Henry Ford Hospital and Health Science Center, Detroit, Michigan 48202, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Flow Velocity / physiology
Blood-Brain Barrier / physiology*
Brain / blood supply*
Capillaries / anatomy & histology,  physiology
Extracellular Space / physiology
Image Enhancement / instrumentation*
Magnetic Resonance Imaging / instrumentation*
Microcirculation / physiology
Rats
Regional Blood Flow / physiology
Grant Support
ID/Acronym/Agency:
P0-1 NS23393/NS/NINDS NIH HHS; R01-NS35626/NS/NINDS NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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