CT Angiographic MPR measurements of degree of stenosis compared with rotational angiographic measurements in 33 carotid arteries
| MPR Method | Observer | Mean Difference* (% ± SD) | r Value | κ Value (95% CI) | |
|---|---|---|---|---|---|
| 50%† | 70%‡ | ||||
| Cross-sectional | 1 | 6.9 ± 17.6 | 0.82 | 0.58 (0.31–0.84) | 0.40 (0.05–0.76) |
| 2 | 10.7 ± 16.1 | 0.86 | 0.58 (0.33–0.83) | 0.29 (−0.04–0.62) | |
| Sagittal | 1 | 2.8 ± 19.2 | 0.80 | 0.70 (0.45–0.94) | 0.40 (0.05–0.76) |
| 2 | 9.1 ± 16.8 | 0.84 | 0.58 (0.31–0.84) | 0.42 (0.06–0.76) | |
* A positive mean difference value indicates an underestimation of stenosis degree with CT angiography.
† 50% cutoff point for hemodynamically significant stenosis.
‡ 70% cutoff point for hemodynamically significant stenosis.