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Figure 1 Agreement for assessment of ejection fraction between magnetic resonance imaging (MRI) and multislice computed tomography (MSCT) (A) and MRI and biplane cineventriculography (CVG) (B) in 88 patients. The agreement is also compared with the reference standard (MRI) for MSCT and transthoracic echocardiography (Echo) (C and D) in the subset of 30 patients who underwent Echo. The mean of the 2 methods compared is always plotted against the difference of the 2. The solid line is the mean of the differences, whereas the dashed lines mark the limit of agreement (95% confidence intervals = 1.96 x SD) according to Bland and Altman (29). There were significantly larger limits of agreement for the comparison of CVG and Echo with MRI (B and D) than for the comparisons of MSCT with MRI (A and C).