| 摘要 |
An ultrasonic imaging apparatus of the present invention performs a tentative scanning of ultrasound to the inside of a living body with delay time corresponding to average sonic velocity, calculates delay time error in a delay time error detecting circuit, by using received signals from each channel to which delay control has been performed in a digital delay circuit, compares in a delay time comparing unit said calculated data with a plurality of delay time error data corresponding to various sonic velocities using sound velocity as the parameter stored beforehand in a sound velocity-derived delay time error storing unit, selects among those sonic velocities the one matching the delay time error data with a sonic velocity selecting unit, and calculates the sonic velocity within the living body. Then, said calculated sonic velocity is fed back to CPU, and the delay data on the delay applied in the ultrasonic scanning is provided to a delay circuit. In this manner, ultrasonic velocity propagating in a medium can be calculated with simple calculation, and the imaging can be done using the delay data corresponding with said velocity in the ultrasonic imaging apparatus. <IMAGE> |
