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nature of current applied to medical ultrasound piezo electric crystals ?

I am trying to write up a talk for my fellow medical colleagues. I am aware that medical ultrasound devices use piezo electric crystals to generate the Ultra sound. I would like to know the nature of the current applied. Is it AC current or DC current that it pulsed on and off. I need to get this right in order not to mislead many who will attend lecture. Thank you.

It is a time-varying voltage that is applied to the piezoelectric crystals. I don't know the exact waveform that is applied; it may be a sinusoidal voltage or it may be a square wave. The shape of the wave (ie, waveform) isn't important. What is important is that if you want to produce, for example, a sound wave at 100K Hertz you must have a time-varying voltage that varies at 100K Hertz.