Fig. 2

a Box plot of the percentage of stenosis detected by IFIR in patients with TRAS (n = 100), by IFIR (n = 27) in patients with TRAS and by DSA (n = 27). The x-axis represents groups, and the y-axis represents percentage of stenosis. b A Bland–Altman plot was performed, 95% confidence interval was − 16.90 to 11.87, and there was one sample (3.7%, < 5%) out of the 95% CI, which demonstrated strong consistency between DSA and IFIR