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Figure 2 (A) Scattergram of mitral valve area (MVA) determined by magnetic resonance imaging (MRI) and cardiac catheterization (CATH) in 17 patients. (B) Bland-Altman plot of the average mean versus the differences between MRI planimetry and MVA derived at CATH. The solid line is the mean difference; the dotted lines mark the standard deviations of the differences.