Device for measuring the speed of moving organs and blood flows

Details Device for measuring the speed of moving organs and blood flows Device for measuring the speed of moving organs and blood flows

1991-02-11

1992-05-05

Jaworski, Francis

Surgery

Truss

Pad

12866107, 7386125, A61B 800

Patent

active

051098563

ABSTRACT:
A first channel processes a received echo signal and comprises a first intercorrelation circuit for two successive echographic signals S.sub.n (t) and S.sub.n+1 (t). A second, parallel channel comprises two symmetrical parallel bandpass filters responsive to the echographic signals for generating from each received signal two signals at a frequency f.sub.1 <f.sub.o and f.sub.2 >f.sub.o, respectively, and supplying s.sub.n1 (t) and s.sub.n2 (t). A multiplier forms sS.sub.n1 (t).times.s.sub.n2 (t). A symmetrical low-pass filter selects the components s.sub.n (t) having the frequency f.sub.2 -f.sub.1 of the multiplier product. A second intercorrelation circuit provides a correlation signal from the selected signal s.sub.n (t) and s.sub.n+1 (t). A multiplexing/interpolation circuit supplies the value of the speed by searching for the maximum of the first correlation function in the vicinity of the maximum of the second correlation function.

REFERENCES:
patent: 4569356 (1986-02-01), Kyozuka
patent: 4744367 (1988-05-01), Kodama et al.
patent: 4803990 (1989-02-01), Bonnefous et al.
patent: 4809249 (1989-02-01), Barnes
patent: 4883060 (1989-11-01), Pesque et al.
P. Atkinson & J. P. Woodcock, "Doppler Ultrasound and Its Use in Clinical Measurement", Academic Press, 1982, pp. 125-128.

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