FIG. 2.

Graphical depiction of an ECG-gated two-dimensional ARFI imaging sequence. Across nine consecutive heartbeats, M-mode ARFI images were repeatedly sampled at twelve lateral locations, multiplexed in quatrains about three excitations regions and separated one-third of the field of view apart. On successive heartbeats, the excitation and tracking locations were then electronically translated across the field of view. At the end of the acquisition, multibeat synthesis was used to reconstruct a sequence of two-dimensional ARFI images through a single cardiac cycle.