Method for matching transmit voltages of different ultrasonic imaging modes

Method for matching transmit voltages in imaging modes of a medical ultrasound imaging system having different transmit power requirements in which a common power supply voltage is directed from a power supply to transmitting elements and when switching between the imaging modes on a line-by-line basis, if the transmit power requirement for an imaging mode is less than that provided by the power supply voltage, the transmit waveform for that imaging mode is pulse width modulated, e.g., by directing pulse width modulation (PWM) signals to the transmitting elements. The power supply voltage is not changed between different imaging modes when imaging on a line-by-line basis. The PWM signals are generated by a timing generator based on the transmit power requirements of the imaging mode so that the total power in the waveform generated by the transmitting elements during that imaging mode does not exceed the transmit power thereof.