Multidetector CT Angiography of Peripheral Vascular Disease: A Prospective Comparison with Intraarterial Digital Subtraction Angiography

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Abstract
OBJECTIVE. The purpose of this study was to determine the accuracy of CT angiography using a multidetector scanner in the evaluation of patients with peripheral vascular disease.SUBJECTS AND METHODS. Eighteen patients with peripheral vascular disease who were referred for elective digital subtraction angiography (DSA) also underwent CT angiography. We scanned patients from the level of the superior mesenteric artery to the pedal arteries in a single helical scan. CT angiograms were produced using maximum-intensity-projection reconstructions. Findings were graded according to six categories: 1, normal (0% stenosis); 2, mild (1-49% stenosis); 3, moderate (50-74% stenosis); 4, severe (75-99% stenosis); 5, occluded; and 6, nondiagnostic. CT angiography findings were compared with DSA findings for each arterial segment.RESULTS. We found agreement for the degree of stenosis in 77.7% of the arteries and discrepancy for 22.3% of the arteries when all categories were considered. Grouping the six categories accordi...