Skip to main content
. 2012 Jan 20;28(6):1315–1327. doi: 10.1007/s10554-012-0016-6

Table 2.

Comparison between 3D QCA and IVUS in assessing lumen size

IVUS 3D QCA Difference (95% CI) Intra-observer variabilitya Inter-observer variabilitya
Positions, n = 519
 Short diameter (mm) 2.51 ± 0.58 2.34 ± 0.56 0.16 (0.13–0.20) 0.022 ± 0.131 0.025 ± 0.097
 Long diameter (mm) 3.02 ± 0.62 2.63 ± 0.58 0.39 (0.36–0.42) 0.039 ± 0.162 0.042 ± 0.092
 Lumen area (mm2) 6.29 ± 2.77 5.08 ± 2.34 1.21 (1.07–1.35) 0.124 ± 0.534 0.134 ± 0.356
Vessels, n = 40
 Short diameter (mm) 2.53 ± 0.39 2.35 ± 0.37 0.18 (0.10–0.26)
 Long diameter (mm) 3.05 ± 0.43 2.64 ± 0.36 0.41 (0.34–0.48)
 Lumen area (mm2) 6.41 ± 1.92 5.12 ± 1.45 1.29 (0.95–1.63)

aObserver variability was calculated from 136 positions from the first 10 vessels. CI Confidence interval; †  P < 0.001