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Figure 1 Bland-Altman plot (A) and correlation graph (B) for plaque volumes per vessel determined by intravascular ultrasound (IVUS) versus 64-slice computed tomography (SCT). Vessel plaque volume is underestimated systematically by 64-slice computed tomography (p < 0.05), and correlation is moderate (Spearman correlation coefficient r2 = 0.69).