Table 3. Similarity indexes of lumen and stent strut detection algorithms.

	Sensitivity	Specificity	Jaccard index	Dice index
Lumen area
Auto vs. R1	98.69 ± 1.07%	99.83 ± 0.15%	97.38 ± 1.11%	98.67 ± 0.58%
Auto vs. R2	98.25 ± 1.30%	99.76 ± 0.16%	96.59 ± 1.19%	98.26 ± 0.62%
R1 vs. R2	98.76 ± 0.64%	99.86 ± 0.01%	97.62 ± 0.56%	98.80 ± 0.29%
Stent struts
Auto vs. R1	90.87 ± 9.44%	94.75 ± 7.60%	86.66 ± 10.08%	92.53 ± 5.97%
Auto vs. R2	91.27 ± 9.34%	94.69 ± 7.54%	87.00 ± 10.05%	92.73 ± 6.00%
R1 vs. R2	98.68 ± 3.73%	98.49 ± 4.54%	97.38 ± 5.28%	98.6 ± 2.93%

Auto—automatic detection algorithm; R1 –image reader 1; R2 –image reader 2