Device for eliminating fixed echoes for an ultrasonic echograph

Details Device for eliminating fixed echoes for an ultrasonic echograph Device for eliminating fixed echoes for an ultrasonic echograph

1988-07-06

1989-11-28

Jaworski, F. J.

Surgery

Truss

Pad

12866109, A61B 806

Patent

active

048830607

ABSTRACT:
A device for eliminating fixed echoes for an ultrasonic echograph, comprising a first filter (100) which consists on the one hand of M parallel lines i (i=1, . . . , M) which a respective delay (i-1)T, where T is the repetition period of the echograph, and on the other hand of weighting means (101i) for the M lines i, the sum of the coefficients (a.sub.i) applied to said lines being zero and, of an adder (102) for the lines i thus delayed and weighted. In accordance with the invention, at least one second filter (200) which has the same structure as and which is dephased by (M-1)T with respect to the first filter (100) is connected parallel to the first filter (100), the pulse response (h.sub.2 (t)) of the second filter being linked to the pulse response (h.sub.1 (t)) of the first filter as:

REFERENCES:
patent: 4751847 (1988-06-01), Katakura et al.
patent: 4803990 (1989-02-01), Bonnefous et al.
Seo, Y. "Utrasonic Diagnostic Equipment" Europ. Patent Appln. EP 088/045 publ. Jun. 15, 1983.
Fehr, R. "A New MIT Structure with Inherent A/D Conversion", Conf: Circuit Theory & Design, Lansanne, Switzerland (Sep. 4-8, 1978).

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