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TABLE 3: 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.

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	−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)