Abstract: An ultrasound imaging method includes identifying a two-level pulse coding scheme (519), which includes a positive voltage value and a negative voltage value, for harmonic imaging. The method further includes driving a pulse generator (510) with the two-level pulse coding scheme. The method further includes producing, with the pulse generator, an excitation pulse. The method further includes routing the excitation pulse through a switch (518) to an ultrasonic transducer array (504), which transmits a first ultrasound signal in response thereto. The method further includes receiving first echoes generated in response to the excitation pulse. The method further includes processing the first echoes to extract a harmonic signal. The method further includes beamforming the harmonic signal to produce an image.