ULTRASONIC DIAGNOSTIC APPARATUS

PROBLEM TO BE SOLVED: To extract a predetermined signal component from received signals transmitted by multistage focus transmission. SOLUTION: At the first and the second multistage focus transmission, a transmission pulse fHgenerator 10 outputs values acquired by multiplying high frequency pulses fHby transmitting weighting values α1and α2respectively, and a transmission pulse fLgenerator 12 outputs values acquired by multiplying low frequency pulses fLby transmitting weighting values α3and α4respectively. A weighting adder circuit 34 multiplies the first and the second received signals by receiving weighting values β1and β2respectively and performs weighting addition, and a weighting adder circuit 36 multiplies the first and the second received signals by receiving weighting values β3and β4respectively and performs weighting addition. A nonlinear fundamental wave component is extracted by setting predetermined conditions on the transmission weighting values and the reception weighting values. COPYRIGHT: (C)2005,JPO&NCIPI