Ultrasonic diagnostic apparatus

An ultrasonic diagnostic apparatus comprising:

• a generator which generates a plurality of frames by repeatedly scanning a subject with an ultrasonic beam;
• a pre-scan controller which sequentially sets, to the generator, a plurality of delay process conditions in a trial based on a plurality of tentative sound velocities such that a plurality of tentative frames are generated;
• a first waveform analyzer which performs a first waveform analysis for at least one reference data sequence along a preset direction in each of the tentative frames to evaluate a sharpness of an image to obtain a plurality of first waveform analysis results for the plurality of tentative frames;
• a second waveform analyzer which performs a second waveform analysis for at least one reference data sequence along a preset direction in each of the tentative frames to evaluate a sharpness of an image to obtain a plurality of second waveform analysis results for the plurality of tentative frames, the second waveform analysis being different from the first waveform analysis;
• an optimum sound velocity calculator which calculates an optimum sound velocity based on the plurality of first waveform analysis results and the plurality of second waveform analysis results;
• and
• a main scan controller which sets, to the generator, a delay process condition for a main scan based on the optimum sound velocity.