Myocardium at risk by T2-weighted imaging and endocardial extent of infarction. Short-axis slices at the same ventricular level of T2-weighted imaging and LGE CMR for endocardial extent of infarction in 3 patients after reperfusion of an acute coronary occlusion. The endocardial borders are traced in red, the epicardial borders are traced in green and the affected region is traced in yellow (MaR for T2-weighted imaging and infarction for LGE CMR). The borders of the endocardial extent of infarction are indicated by dashed lines. Within each image the total MaR is given as a percent of left ventricle. The upper panel shows a patient with an aborted infarction, the middle panel a patient with > 90% myocardial salvage and the lower panel a patient with 40% myocardial salvage. Note the difference in size of the MaR by T2-weighted imaging and endocardial extent of infarction for the patient with an aborted infarction and the patient with > 90% myocardial salvage.