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Three-dimensional color Doppler sonography in carotid artery stenosis
Robert A Bucek1, Markus Reiter, Albert Dirisamer
1University Clinic for Radiology, Department of Angiography and Interventional Radiology, Vienna General Hospital, Vienna, Austria.
Background And Purpose:
Color Doppler sonography (CDS) suffers from such disadvantages as high interobserver variability and problems with data presentation and storage. We therefore performed a prospective trial to assess the role of three-dimensional CDS (3D-CDS) in the evaluation of internal carotid artery stenosis (ICAS).
Methods:
We included 32 consecutive patients with sonographically verified ICAS (30-99%) and 16 asymptomatic volunteers. All underwent CDS and 3D-CDS, and 23 patients also underwent intraarterial angiography. The sensitivity, specificity, positive predictive value, and negative predictive value for the detection of high-grade ICAS were analyzed by three blinded readers, who also graded the percentage of ICAS.
Results:
CDS revealed 14 patients with mild to moderate ICAS and 18 patients with high-grade ICAS. Mean sensitivity of 3D-CDS was 81.5%, mean specificity was 98.9%, mean positive predictive value was 97.9%, and mean negative predictive value was 89.9%. 3D-CDS correlated significantly with CDS (mean r=0.85; P<.001) and angiography (mean r=0.57; P=.01).
Conclusion:
3D-CDS findings correlate with those obtained by CDS and angiography; 3D-CDS also offers excellent interobserver correlation, positive predictive value, and specificity, approaching 100% for the detection of high-grade ICAS.