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TABLE 2: 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.

MPR Method	Observer	Mean Difference^* (% ± SD)	r Value	κ Value (95% CI)
MPR Method	Observer	Mean Difference^* (% ± SD)	r Value	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)