| 摘要 |
An ultrasonic diagnostic apparatus for accurately displaying the velocity distribution of moving members within a living organism. The apparatus constitutes an improvement on the ultrasonic diagnostic apparatus of the type wherein an ultrasonic pulse beam is repeatedly transmitted into the living organism at a fixed pulse rate and the reflected echoes are picked up, amplified and displayed, wherein the improvement comprises a complex signal converter for converting a received high frequency signal into complex signals by mixing the received high frequency signal with a pair of complex reference signals which have frequencies that are integer multiples of the pulse rate and which are complexly related to one another, an autocorrelator for determining the autocorrelation of the complex signals, the autocorrelator having a delay time equal to an integer multiple of the pulse period, and a velocity determination circuit for determining the velocity through said autocorrelation. The apparatus is capable of measuring the velocity distribution of moving members within the organism and of rapidly displaying the measured results in real time. |
