Ultrasonic diagnostic apparatus capable of acquiring high quality image by correcting phase distortion contained in ultrsonic pulses

Abstract

In an ultrasonic diagnostic apparatus (1000), ultrasonic propagation time differences contained in echo signals reflected from a biological body under medical examination are corrected by comprising: a quadrature phase detecting unit (30:130:25) for quadrature-phase-detecting the echo signals derived from an ultrasonic transducer probe (2) to obtain as phase data a quadrature signal component and an in-phase signal component; a delay-time correcting value calculating unit (23) for calculating at least one of delay-time correcting values used for the energizing signals and the echo signals based upon both of the quadrature signal component and in-phase signal component: and, a delay controlling unit (13) for controlling at least one of delay time data previously given to the energizing signals and echo signals based upon one of calculated delay-time correcting values.