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Fig. 2. —Schematic diagram shows special gradient-echo phase-contrast MR imaging sequence, incorporating cyclic motion-encoding gradients, which can be applied along any axis. Trigger pulses from sequencing computer of imager are used to control acoustic driver, ensuring synchronization of applied acoustic waves with motion-encoding gradients. Resulting phase images depict propagating acoustic waves with motion amplitudes of less than 1 µm. RF = radiofrequency; x, y, z = gradient axes.