Method and apparatus for avoiding ambiguities in a pulse doppler

Details Method and apparatus for avoiding ambiguities in a pulse doppler Method and apparatus for avoiding ambiguities in a pulse doppler

1991-03-21

1992-01-21

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 802

Patent

active

050819941

ABSTRACT:
In a method for calculating the flow velocity of, for example a blood stream, ultrasound pulses are repeatedly transmitted into an examination region with a spacing of a pulse repetition time (Tr). An autocorrelation function (Kii) and a cross correlation function (Kiq) in an environment (Tr.+-.1.5 T) around the pulse repetition time (Tr) are formed from the quadrature components (i, q) of echo signals of respectively successive transmission pulses. The shift of the maximum (.DELTA.t) of the correlation functions (Kii, Iiq) relative to the pulse repetition time (Tr) as a result of the velocity of the flow is fixed in a region (Bn) wherein the ambiguous, mean Doppler frequency (.omega.) identified in a traditional way lies. The apparatus for the implementation of this method comprises a shift identification circuit for this purpose. This shift identification circuit calculates the shift of the maximum (.DELTA.t) of one or both correlation functions (Kii, Kiq) relative to the pulse repetition time (Tr).

REFERENCES:
patent: 4680739 (1987-07-01), Lannuzel
patent: 4800891 (1989-01-01), Kim
patent: 4928698 (1990-05-01), Bonnefous
patent: 4979513 (1990-12-01), Sakai et al.
patent: 4993417 (1991-02-01), Seo
patent: 4995397 (1991-02-01), Nishiyama et al.
Ultrasonic Imaging 8, 73-85 (1986), "Time Domain Formulation of Pulse-Doppler Ultrasound and Blood Velocity Estimation by Cross Correlation", by O. Bonnefous et al., pp. 73-85.

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