PROBLEM TO BE SOLVED: To provide an ultrasound diagnostic apparatus which permits high quality ultrasonographic images to be obtained while restraining an increase in the internal temperature of an ultrasound probe.SOLUTION: The ultrasound diagnostic apparatus includes a receiving and amplifying section arranged in the ultrasound probe and having an amplifier amplifying reception signals output from a vibrator array, a switching means for switching the electric current value of bias electric current supplied to the amplifier, and a selector switch provided in the ultrasonic probe and performing the switching operation of the electric current value by the switching means.COPYRIGHT: (C)2013,JPO&INPIT【課題】超音波プローブの内部温度の上昇を抑制しながらも高画質の超音波画像を得ることができる超音波診断装置を提供する。【解決手段】超音波プローブ内に配置され、振動子アレイから出力される受信信号を増幅する増幅器を有する受信増幅部と、増幅器に供給されるバイアス電流の電流値を切り替える切替手段と、超音波プローブに設けられ、切替手段による電流値の切り替え操作を行なう切替スイッチとを有する。【選択図】図1
