Fig. 2
CMR strain images. Illustration of left ventricular (LV) tracking on mid-ventricular level short-axis cine images in a patient with paroxysmal atrial fibrillation (AF) patient. a Mid-ventricular level short-axis cine image. Borders of endocardial (red line) and epicardial borders (green line) were manually delineated with the initial contour set at end-diastole. Papillary muscles were excluded from the endocardial contour. b The LV 2D circumferential strain curve. The peak systolic circumferential strain (εs) was identified from the strain curve. c The LV strain rate curve. The peak systolic circumferential strain rate (SRs) and early diastolic circumferential strain rate (SRe) were determined from the strain rate curve