Table 3.
Comparison between 3D QCA and OCT in assessing lumen size
| OCT | 3D QCA | Difference (95% CI) | Intra-observer variabilitya | Inter-observer variabilitya | |
|---|---|---|---|---|---|
| Positions, n = 541 | |||||
| Short diameter (mm) | 2.70 ± 0.65 | 2.57 ± 0.61 | 0.14(0.11–0.16)† | 0.000 ± 0.013 | 0.003 ± 0.029 |
| Long diameter (mm) | 3.11 ± 0.72 | 2.80 ± 0.62 | 0.30 (0.27–0.33)† | 0.003 ± 0.024 | 0.006 ± 0.035 |
| Lumen area (mm2) | 7.01 ± 3.28 | 5.93 ± 2.66 | 1.07 (0.95–1.20)† | 0.002 ± 0.039 | 0.021 ± 0.059 |
| Vessels, n = 40 | |||||
| Short diameter (mm) | 2.71 ± 0.46 | 2.57 ± 0.43 | 0.14 (0.09–0.19)† | – | – |
| Long diameter (mm) | 3.11 ± 0.52 | 2.81 ± 0.45 | 0.30 (0.24–0.37)† | – | – |
| Lumen area (mm2) | 7.02 ± 2.34 | 5.94 ± 1.91 | 1.08 (0.80–1.37)† | – | – |
aObserver variability was calculated from 165 positions from the first 10 vessels. CI Confidence interval; † P < 0.001