Fig. 1

CMR processing and wall motion pattern analysis. Endocardial contours were traced on short-axis cine images (a; red circle) and the distance to the centroid computed for each site (b). Each color curve represents a corresponding colored line from a; 100 sites were sampled per slice, however, only 12 are shown here for graphical simplicity. Each regional radial displacement curve is compared by cross-correlation (sliding in time) to a patient-specific reference (b; yellow dotted line) to determine the mechanical delay time. Delay times are mapped to a modified American Heart Association 17-segment model (c). Note the early motion in the septal segments in b, shown in red in c, represents the septal flash