Radiology, Vol 192, 351-357, Copyright © 1994 by Radiological Society of North America

ARTICLES

Peripheral vascular occlusive disease: accuracy and reliability of time- of-flight MR angiography

TR McCauley, A Monib, KW Dickey, J Clemett, GH Meier, TK Egglin, RJ Gusberg, M Rosenblatt and JS Pollak
Department of Diagnostic Radiology, Yale University School of Medicine, New Haven, CT 06510.

PURPOSE: To determine the accuracy and reliability of magnetic resonance (MR) angiography for identification of stenosis and patent distal vessels in patients with peripheral vascular disease. MATERIALS AND METHODS: Two-dimensional time-of-flight MR angiography and conventional arteriography were performed in 22 patients. Four blinded radiologists independently graded multiple anatomic segments. RESULTS: MR angiography allowed detection of more patent vessel segments than did conventional arteriography. For detection of significant stenosis (> 75%), MR angiography had 43%-67% sensitivity and 74%-89% specificity. Discrepancies in detection of significant stenosis occurred in 39 segments for the most accurate reviewer; 27 of these discrepancies were avoidable. CONCLUSION: For detection of significant stenosis, MR angiography has low to moderate sensitivity and specificity; however, observer variability appears to be a major contributing factor to the discrepancies. Greater reviewer experience or techniques for improving reliability may improve the accuracy of MR angiography in peripheral vascular disease.

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