Ultrasound diagnostic apparatus

An ultrasound diagnostic apparatus that is connectable with an ultrasound probe having a capacitive micro-machined ultrasonic transducer whose sensitivity can be controlled in accordance with an applied bias voltage, comprising:

• a bias voltage output portion capable of varying the bias voltage that is applied to the capacitive micro-machined ultrasonic transducer;
• a transmission signal output portion that outputs an ultrasound transmission signal to the capacitive micro-machined ultrasonic transducer;
• an operation portion that outputs an instruction signal that instructs the ultrasound diagnostic apparatus including the bias voltage output portion and the transmission signal output portion;
• and
• a control portion that, based on an instruction signal from the operation portion, controls the bias voltage output portion and the transmission signal output portion to control output timings of the bias voltage and the transmission signal so as to output the ultrasound signal after outputting the bias voltage or to stop output of the bias voltage after stopping output of the ultrasound signal;
• wherein:
• a piezoelectric ultrasound transducer that does not require bias voltage control can be connected to the ultrasound diagnostic apparatus, and the ultrasound diagnostic apparatus further includes a display portion that displays an ultrasound image based on a reception signal that is received by the capacitive micro-machined ultrasonic transducer;
• and
• the control portion causes a connection state that shows which one of the piezoelectric ultrasound transducer and the capacitive micro-machined ultrasonic transducer is connected to be displayed on the display portion.