Diagnostic performance color duplex ultrasonography, B-flow imaging, and a combination of these tests in detecting 70% of 99% internal carotid artery stensosis
| Criteria | Sens (%) | Spec (%) | PPV (%) | NPV (%) | ACC (%) | MRate (%) |
|---|---|---|---|---|---|---|
| BFI ≥ 70% | 65 | 98 | 91 | 92 | 92 | 8.1 |
| PSV ≥ 230 cm/s | 91 | 93 | 74 | 98 | 92 | 7.6 |
| PSV ≥ 230 cm/s + BFI ≥ 70% | 90 | 98 | 90 | 98 | 97 | 2.8 |
| EDV ≥ 75 cm/s | 91 | 95 | 81 | 98 | 94 | 5.8 |
| EDV ≥ 75 cm/s + BFI ≥ 70% | 95 | 99 | 95 | 99 | 99 | 1.4 |
| PSVICA/CCA ≥ 3.6 | 94 | 96 | 83 | 99 | 95 | 4.7 |
| PSVICA/CCA ≥ 3.6 + BFI ≥ 70% | 95 | 99 | 95 | 99 | 99 | 1.4 |
Note.—Sens indicates sensitivity; Spec, specificity; PPV, positive predictive value; NPV, negative predictive value; Acc, accuracy; MRate, misclassification rate; BFI, B-flow imaging; PSV, peak systolic velocity; EDV, end diastolic velocity; PSVICA/CCA, ratio of ICA to common carotid artery peak systolic velocity.