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Introduction : We assessed myocardial edema by quantitative T2 mapping in patients with acute myocardial infarction (AMI) and compared the size of myocardial edema with those of infarcted and dysfunctional myocardium.Method : Cardiac magnetic resonance images (MRIs) of 31 patients (M:F =29:2, mean age: 52.5 ± 10.8 years) with AMI were reviewed.Cardiac MRIs included cine-MRls, quantitative T2 mapping images, and late gadolinium enhancement (LGE) images.On cine-MRl, all short axis images of the left ventricle (LV) were divided into 60 sectors for regional contractility calculations.