Table 2

Segmental Correlation Between CTA and QCA Based on Anatomical Coregistration

Mean ValuesCorrelationBland-Altman Analysis
ParameterCTA (Mean ± SD)QCA (Mean ± SD)p Value for t Testr Valuep ValueMean Difference (Absolute)Mean Difference (%)Limits of Agreement (Absolute)Limits of Agreement (%)
MLD, mm1.6 ± 0.61.8 ± 0.60.120.55<0.001−0.15−10%±1.2±72%
%DS47.5 ± 17.247.1 ± 15.10.880.440.001−0.03−2.8%±34±85%

CTA = computed tomography angiography; MLD = minimal lumen diameter; QCA = quantitative coronary angiography; %DS = percentage of diameter stenosis.