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pubmed-article:15884098pubmed:dateCreated2005-7-28lld:pubmed
pubmed-article:15884098pubmed:abstractTextArterial spin labeling (ASL) techniques are now recognized as valid tools for providing accurate measurements of cerebral and cardiac perfusion. The labeling process used with most ASL techniques creates two problems, magnetization transfer (MT) effects and arterial transit time effects, that require compensation. The compensation process limits time resolution and hinders absolute quantification. MT effects are particularly problematic in skeletal muscle because they are large and change rapidly during exercise. The protocol presented here was developed specifically for quantification of perfusion in exercising skeletal muscle. The ASL technique that was implemented, FAWSETS, eliminates MT effects and arterial transit times. Localized, single-voxel perfusion measurements were acquired from rat hind limbs at rest, during ischemia and during three different levels of stimulated exercise. The results demonstrate sufficient sensitivity to determine the time constants for perfusion changes at onset of, and during recovery from, exercise and to distinguish the differences in the amplitude of the perfusion response to different levels of exercise. Additional measurements were conducted to demonstrate insensitivity to MT effects. The exercise protocol is easily adaptable to phosphorous magnetic resonance measurements, allowing the possibility to acquire local measurements of perfusion and metabolism from the same tissue in future experiments.lld:pubmed
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pubmed-article:15884098pubmed:authorpubmed-author:HyytiOuti MOMlld:pubmed
pubmed-article:15884098pubmed:authorpubmed-author:KushmerickMar...lld:pubmed
pubmed-article:15884098pubmed:authorpubmed-author:MarroKenneth...lld:pubmed
pubmed-article:15884098pubmed:copyrightInfoCopyright (c) 2005 John Wiley & Sons, Ltd.lld:pubmed
pubmed-article:15884098pubmed:issnTypePrintlld:pubmed
pubmed-article:15884098pubmed:volume18lld:pubmed
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pubmed-article:15884098pubmed:pagination322-30lld:pubmed
pubmed-article:15884098pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:15884098pubmed:year2005lld:pubmed
pubmed-article:15884098pubmed:articleTitleFAWSETS perfusion measurements in exercising skeletal muscle.lld:pubmed
pubmed-article:15884098pubmed:affiliationDepartment of Radiology, University of Washington, Seattle, Washington, USA. marro@u.washington.edulld:pubmed
pubmed-article:15884098pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15884098pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:15884098pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:15884098pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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