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Abstract

Cerebrovascular transit characteristics of DyDTPA-BMA and GdDTPA-BMA on normal and ischemic cat brain.

J Kucharczyk, H Asgari, J Mintorovitch, Z Vexler, S Rocklage, A Watson and M Moseley
American Journal of Neuroradiology March 1993, 14 (2) 289-296;
J Kucharczyk
Neuroradiology Section, University of California, San Francisco.
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H Asgari
Neuroradiology Section, University of California, San Francisco.
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J Mintorovitch
Neuroradiology Section, University of California, San Francisco.
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Z Vexler
Neuroradiology Section, University of California, San Francisco.
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S Rocklage
Neuroradiology Section, University of California, San Francisco.
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A Watson
Neuroradiology Section, University of California, San Francisco.
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M Moseley
Neuroradiology Section, University of California, San Francisco.
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Abstract

PURPOSE To compare the efficacy of two nonionic T2*-shortening contrast agents, DyDTPA-BMA dysprodiamide injection and GdDTPA-BMA gadodiamide injection, as perfusion-sensitive MR imaging agents in normal and acutely ischemic brain.

METHODS The magnetic susceptibility effects of intravenous injections of 0.10-0.50 mmol/kg of each contrast agent were quantified on T2-weighted spin-echo images of cat brain before and after unilateral occlusion of the middle cerebral artery by measuring signal intensity changes in the same regions-of-interest in parietal cortex.

RESULTS In normal brain, DyDTPA-BMA produced a significantly greater loss of signal intensity than equimolar doses of GdDTPA-BMA. The magnitude of the signal intensity attenuation was dosage-dependent and proportional to the square of the magnetic moments of the two contrast agents. Restoration of baseline image signal intensity was observed within 30 min after each injection. However, injection of GdDTPA-BMA also produced a delayed, persistent hyperintensity on T2-weighted images, presumably due to its underlying T1-shortening effect. Following unilateral occlusion of the middle cerebral artery, unenhanced T2-weighted images failed to show evidence of cerebral injury for 1.5-3 hours. Administration of 0.10-1.0 mmol/kg DyDTPA-BMA shortened the time for detection of perfusion deficits (residual hyperintensity) in 22 of 36 (61%) treated cats, often to within 30 min after arterial occlusion. DyDTPA-BMA enhancement also improved lesion conspicuity in 26 of 36 (72%) cases, and disclosed very small infarcts that were not visible on T2-weighted precontrast images. Perfusion deficits in areas of partial ischemia were seen more clearly on DyDTPA-BMA-enhanced images than after equimolar injections of GdDTPA-BMA.

CONCLUSIONS Magnetic susceptibility contrast-enhanced MR imaging enables detection of perfusion deficits associated with acute cerebral ischemia well in advance of conventional T2-weighted spin-echo MR imaging without contrast. DyDTPA-BMA appears to delineate regions of ischemic damage better than GdDTPA-BMA.

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American Journal of Neuroradiology
Vol. 14, Issue 2
1 Mar 1993
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Cerebrovascular transit characteristics of DyDTPA-BMA and GdDTPA-BMA on normal and ischemic cat brain.
J Kucharczyk, H Asgari, J Mintorovitch, Z Vexler, S Rocklage, A Watson, M Moseley
American Journal of Neuroradiology Mar 1993, 14 (2) 289-296;

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Cerebrovascular transit characteristics of DyDTPA-BMA and GdDTPA-BMA on normal and ischemic cat brain.
J Kucharczyk, H Asgari, J Mintorovitch, Z Vexler, S Rocklage, A Watson, M Moseley
American Journal of Neuroradiology Mar 1993, 14 (2) 289-296;
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