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Fig. 3. —Receiver operating characteristic curves for three-dimensional (3D) gadolinium MR angiography (solid line) and 3D time-of-flight MR angiography (dotted line) with conventional angiography as standard of comparison, including 63 carotid bifurcations. Areas under receiver operating characteristic curves are calculated at 0.88 (95% confidence interval, 0.78-0.95) and 0.90 (0.80-0.96), respectively, showing no significant differences between these two noninvasive techniques (p = 0.62).