Patent ID: 6659951
Filing Date: 2003-12-09
Classification: G01S

Abstract:
An ultrasonic diagnosis device comprising:wave transmitting means for driving an element group disposed in an array, for synthesizing first and second transmission wave signals having mutually different frequencies &ohgr;1 and &ohgr;2 as center frequencies thereof; digital converting means for sampling signals obtained by detecting reflection echoes in said ultrasonic element group at a sampling frequency higher than a Nyquist frequency of an upper limit of a signal band and converting them to digital signals, respectively; mixing means for multiplying said digital signals by first reference signal having a frequency near said &ohgr;1 and a second reference signal having a frequency near said &ohgr;2 by alternately switching them; a multiplexer for assorting alternately multiplication results of said mixing means; accumulating means for mutually and independently accumulating mutually multiplication results assorted in a direction of lapse of time and obtaining first and second accumulation results; and multiplexed wave reception focusing means for imparting a delay distribution for aligning a phase difference peculiar to each of said ultrasonic elements to each of said first and second accumulation results, respectively, and beamforming and adding said accumulation results.