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Figure 1 Comparison of minimal lumen diameter measurements obtained by intravascular ultrasound (IVUS) and quantitative coronary angiography (QCA) before intervention (A), after rotational atherectomy (B) and after percutaneous transluminal coronary angioplasty (PTCA) (C) using the Bland-Altman method. The individual differences between pairs of measurements (on the y-axis) are plotted against the mean value of IVUS and QCA (on the x-axis). CI = confidence interval.