Table 2. Inter- and intra-observer agreement of CFD parameters derived from IVUS/ICA in 3 randomly selected arteries.
| Parameter | Interobserver agreement | Intraobserver agreement | |||
|---|---|---|---|---|---|
| Pearson r | ICC (95% CI) | Pearson r | ICC (95% CI) | ||
| Area (mm2) | 0.980 | 0.993 (0.990–0.996) | 0.982 | 0.991 (0.987–0.994) | |
| Velocity (cm/s) | 0.992 | 0.994 (0.990–0.996) | 0.989 | 0.992 (0.988–0.995) | |
| Re | 0.991 | 0.990 (0,985–0.994) | 0.990 | 0.988 (0.981–0.992) | |
| Pressure (Pa) | 0.970 | 0.988 (0.982–0.992) | 0.937 | 0.979 (0.969–0.986) | |
| WSS (Pa) | 0.936 | 0.928 (0.888–0.953) | 0.920 | 0.926 (0.890–0.950) | |
| APS (Pa) | 0.802 | 0.910 (0.861–0.942) | 0.748 | 0.884 (0.827–0.922) | |
Data are presented as mean ± standard deviation. For all the variables, the Pearson’s correlation coefficient r was significant (P<0.01). CFD, computational fluid dynamics; IVUS intravascular ultrasound; ICA, intravascular coronary angiography; ICC, intraclass correlation coefficient; CI, confidence interval; Re, Reynolds number; WSS, wall shear stress; APS, axial plaque stress.