MRE of a pig heart in the short-axis view. a) Standard cine MR in a systolic heart phase. The white line on the lateral chest wall of the pig marks the connection plate of the mechanical driver. b) Resultant MRE wave amplitudes of 48.3 Hz drive frequency combining all three spatial wave components (the dashed line indicates the systolic LV circumference obtained by manual segmentation). c) Correlation map showing the regions where wave amplitudes vary in synchrony with the heart beat. Dashed, dotted, and solid lines symbolize systolic LV boundaries, and ROIs corresponding to ζ = 0 and ζ = 0.9, respectively. The single dot indicates ζ = 1, i.e. maximum .