CT angiographic MPR measurements of degree of stenosis compared with DSA measurements in 70 carotid arteries
| MPR Method | Observer | Mean Difference* (% ± SD) | r Value | κ Value (95% CI) | |
|---|---|---|---|---|---|
| 50%† | 70%‡ | ||||
| Cross-sectional | 1 | −0.4 ± 23.0 | 0.76 | 0.53(0.33–0.73) | 0.50(0.27–0.72) |
| 2 | 5.3 ± 21.8 | 0.76 | 0.70(0.53–0.87) | 0.36(0.14–0.58) | |
| Sagittal | 1 | −3.8 ± 24.5 | 0.73 | 0.55(0.36–0.74) | 0.54(0.32–0.76) |
| 2 | 3.7 ± 21.7 | 0.77 | 0.79(0.65–0.94) | 0.38(0.15–0.61) | |
* A positive mean difference value indicates an underestimation of stenosis degree with CT angiography.
† 50% cutoff point for significant stenosis.
‡ 70% cutoff point for significant stenosis.