PURPOSE: To arrange a highly accurate function of correcting nonuniformity of sound velocity by providing an ultrasonic diagnostic apparatus with a second ultrasonic transmission/reception mode for detecting a time shift caused by the nonuniformity of sound velocity in vivo to improve the S/N ratio for increasing a sound pressure of a signal received and detection accuracy of the time shift.
CONSTITUTION: A transmitting section 2 has two systems a transmission system 21 for detecting time shift and a transmission system 22 for displaying tomographic images. When the transmission system 21 for detecting the time shift is selected by a transmission system selecting means 23, pulses with the number thereof determined by a number of pulses control means 211 are generated by a pulse generating means 212. The number of the pulses is greater than that in the transmission for display tomographic images. As the number of pulses increases, the sound pressure of an ultrasonic wave as radiated from an electroacoustic conversion element 1 increases thereby improving the S/N ratio of the signal received with the electroacoustic conversion element 1. As a result, errors in the detection of a time shift are reduced thereby allowing improvement in correction effect.
IIDA ATSUO
WATANABE KAZUHIRO
SAITO MASAO
