Ultrasonic diagnostic apparatus

Details Ultrasonic diagnostic apparatus Ultrasonic diagnostic apparatus

1983-04-21

1986-03-04

Kamm, William E.

Surgery

Truss

Pad

7386125, A61B 1000

Patent

active

045734771

ABSTRACT:
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.

REFERENCES:
patent: 3844170 (1974-10-01), Critten
patent: 4201083 (1980-05-01), Kurita et al.
patent: 4324258 (1982-04-01), Huebscher et al.
patent: 4334543 (1982-06-01), Fehr
Nowicki et al., An Infinite Gate Pulse Doppler, Ultrasound in Med. & Biol., vol. 7/No. 1, pp. 41-50, Feb. 1981.
Brandestini, Topoflow-A Digital Full Range Doppler Velocity Meter, IEEE Transactions on Sonics and Ultrasonics, vol. SU-25, No. 5, Sep. 1978, pp. 287-293.
Brandestini et al., Blood Flow Imaging Using a Discrete Time Frequency Meter, IEEE Ultrasonics Symposium Proceedings, Cat. #78, Ch. 1344-ISU, Sep. 1978, pp. 348-352.

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