Fig. (1).

Power Modulation Imaging. In Power Modulation Imaging two consecutive pulses with identical shape but a twofold difference in amplitude are sent out and result in identical reflections from cardiac tissue, other than the expected twofold difference in amplitude. The smaller pulse is then multiplied by two and subtracted from the larger one, resulting in zero signal. The same two pulses, when reflected by nonlinear MB, produce signals of different shape and amplitude. Amplifying the smaller pulse and subtracting it results in a non-zero signal.