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Carotid Bifurcation: Evaluation of Time-resolved Three-dimensional Contrast-enhanced MR Angiography

2001; Radiological Society of North America; Volume: 220; Issue: 2 Linguagem: Inglês

10.1148/radiology.220.2.r01au43525

1527-1315

Timothy J. Carroll, Frank R. Korosec, Gregory M. Petermann, Thomas M. Grist, Patrick A. Turski,

Cerebrovascular and Carotid Artery Diseases

A magnetic resonance (MR) angiographic protocol was evaluated in the carotid bifurcation with use of a pulse sequence for time-resolved three-dimensional imaging of contrast material kinetics. The enhancement ratio, a quantitative measure of contrast enhancement, indicated that all studies included an image obtained near the peak of the intraarterial concentration of contrast agent (enhancement ratio, 90% +/- 9 [standard deviation]). Studies acquired at a higher frame rate (4.1-4.9 seconds) exhibited less venous enhancement (enhancement ratio, 25% +/- 16) than studies acquired with slower (6.0-9.6-second) frame rates (enhancement ratio, 46% +/- 25).