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7984064

Source:http://linkedlifedata.com/resource/pubmed/id/7984064

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pubmed-article:7984064pubmed:abstractTextInversion recovery gradient recalled echo planar imaging (TI/TR/TE = 700/2000/10 ms) was used to dynamically monitor the first pass of an intravascular (GdDOTA-polylysine) and an extravascular (GdDTPA-BMA) contrast agent through normal rat myocardium. It was found that myocardial enhancement increased with dose of the intravascular agent to a limiting value of approximately 50% of fully relaxed intensity, consistent with enhancement of 40% of myocardial water content during the first pass. Larger doses produced no further increase in peak response. On the other hand, the extravascular agent caused incrementally increased enhancement throughout the dose range examined to a final value of 68 +/- 2% of fully relaxed intensity. The profile of dose dependence for both agents was inconsistent with monoexponential T1 relaxation. It was concluded that: (a) compartmentalization of myocardial water combined with restricted myocardial water diffusion limits the peak response during bolus transit; (b) extraction of the extravascular agent during transit elevates the peak response over that obtained from agent confined to the vascular volume; and (c) models that assume simple monoexponential T1 relaxation to derive time-density curves do not adequately describe the relationship between changes in signal intensity, R1 and contrast concentration.lld:pubmed
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pubmed-article:7984064pubmed:articleTitleInversion recovery EPI of bolus transit in rat myocardium using intravascular and extravascular gadolinium-based MR contrast media: dose effects on peak signal enhancement.lld:pubmed
pubmed-article:7984064pubmed:affiliationDepartment of Radiology, University of California, San Francisco 94143-0628.lld:pubmed
pubmed-article:7984064pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7984064pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:7984064pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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