Fig. 4

Example of automatic tracking result. A typical result of the atrioventricular plane displacement (AVPD) in the left ventricle (LV) by automatic tracking is shown as a solid black line in the left and right panel. A more negative AVPD correspond to a larger displacement. In the left panel, the corresponding manually measured AVPD in the LV is shown as a dotted line. The right panel illustrate how the peak emptying velocity, peak filling velocity, and atrial contraction are obtained. The slope of the dashed red line corresponds to the peak emptying velocity, and the slope of the dashed blue line corresponds to the peak filling velocity. The length of the purple dashed line divided by the AVPD at end systole gives the atrial contraction in %