| 摘要 |
In an ultrasonic imaging apparatus, the pulser applies drive pulses to the transducer element. Depending upon the transducer characteristics and the scanning mode of the ultrasonic beams, the pulser is required to apply proper drive voltage to a given transducer element. The voltage selector switch is provided to select the desirable drive voltage from the power source. Further, the transistor is provided to adjust the selected drive voltage so as to obtain the most preferable drive voltage for the transducer element.
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