Ultrasonic diagnosing apparatus

An ultrasonic diagnosing apparatus comprising:

• an ultrasonic transducer having a plurality of piezo-electric elements arranged in an array;
• a transmitting means for forming at least one electronically converged ultrasonic beam by driving a transmitting aperture, wherein said transmitting aperture consists of at least two of said piezo-electric elements driven in accordance with predetermined delays;
• a waveform storing means for storing a plurality of waveforms, each of said plurality of waveforms corresponding to a reflected signal received by a corresponding one of said plurality of piezo-electric elements;
• a wavefront locus storing means for storing a plurality of wavefront locus data corresponding to a plurality of focal points in an object under inspection, wherein said wavefront locus data comprises a data set of delay time that said piezo-electric elements form a wavefront focusing upon one of said focal points, and for outputting said wavefront locus data to said waveform storing means as read-out addresses such that said waveform storing means outputs a spatial distribution of said reflected signals along the direction of said wavefront;
• a data conversion means for converting said spatial distribution of said reflected signals from a spatial domain into a spatial frequency domain along said wavefront locus;
• a velocity deriving means for deriving a velocity of a moving target in said object under inspection from the resulting spatial frequency distribution out of said data conversion means;
• a filtering means for extracting signal components reflected from the moving target in said object under inspection by removing signal components reflected from a static target, the output of the filtering means being supplied to said waveform storing means;
• and
• a transmission triggering means for outputting a plurality of trigger pulses to said transmitting means, said transmitting aperture being driven twice for every receiving operation of the respective piezo-electric elements, wherein said filtering means includes a deviation calculating means for calculating a deviation signal between two reflected signals acquired in response to two driving operations of said transmitting aperture.