TABLE 6:
Diagnostic performance of CT angiography in the assessment of carotid artery stenosis on the symptomatic side compared with DSA
| Analysis Method of CT Angiography | Sensitivity (%) | Specificity (%) | Overall Accuracy (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|---|
| Visual | 100 (21/21) | 50 (7/14) | 80 (28/35) | 75 (21/28) | 100 (7/7) |
| Combined MPR* | 95 (20/21) | 86 (12/14) | 91 (32/35) | 91 (20/22) | 92 (12/13) |
| Visual-quantitative† | 95 (20/21) | 93 (13/14) | 94 (33/35) | 95 (20/21) | 93 (13/14) |
Note.—PPV indicates positive predictive value; NPV, negative predictive value. Numbers in parentheses are number of arteries. A 50% stenosis was the cutoff point for a hemodynamically significant stenosis.
*
Combined MPR was considered to be positive when either of the MPR (cross-sectional or oblique sagittal) measurements yielded a positive result.
†
Visual-quantitative analysis consisted of first-line visual CT angiography interpretation and subsequent measurement only for the positive cases.