Patent ID: 8491476

Claim:
An ultrasound imaging apparatus, comprising: a plurality of transducers; a part configured to receive a synchronizing signal indicating a period for transmitting and receiving ultrasound waves and output a transmission signal after a first time t 1 from a time indicated by the synchronizing signal; a bias current supply part configured to receive the synchronizing signal and, in a case that an output voltage supplied to the plurality of transducers is equal to or more than a threshold value, supply a bias current during a time interval ΔT 2 including a time interval ΔT 1 during which the transmission signal is outputted, before a time point that the first time t 1 elapses and after a lapse of a second time t 2 shorter than the first time t 1 from the time indicated by the synchronizing signal and, in a case that the output voltage is less than the threshold value, keep supplying the bias current from a time point a third time t 3 indicating a time after which the first time t 1 is elapsed before the time indicated by a subsequent synchronizing signal; an amplifier configured to receive the supply of the bias current to amplify the transmission signal to the output voltage and supply the transmission signal to the plurality of transducers; and an image generator configured to generate ultrasound image data based on reception signals received by the plurality of transducers.