Surgery – Truss – Pad
Patent
1992-12-10
1994-06-14
Kamm, William E.
Surgery
Truss
Pad
12866109, 12866101, 7386125, A61B 800
Patent
active
053201051
ABSTRACT:
An echograph includes a transmission stage (20), a circuit (31) for suppressing fixed echos, and a correlation-interpolation circuit (33).
The the transmission stage (20) transmits a pulsed signal having two neighboring, alternating recurrent periods T.sub.1 and T.sub.2, the fixed echo suppression circuit (31) being adapted to double the recurrent period and comprises two outputs having the index even and odd, the correlation-interpolation circuit (33) performing, for each velocity, two distinct correlations, one of which is associated with the period T.sub.1 whereas the other is associated with the period T.sub.2, after which these two correlations are compared so as to derive a non-ambiguous velocity value therefrom.
REFERENCES:
patent: 4799490 (1989-01-01), Namekawa
patent: 4803990 (1989-02-01), Bonnefous et al.
patent: 4955386 (1990-09-01), Nishiyama et al.
patent: 5062430 (1991-11-01), Bonnefous
patent: 5156153 (1992-10-01), Bonnefous
patent: 5163434 (1992-11-01), Kamazawa
patent: 5201313 (1993-04-01), Katakura
"Doppler Ultrasound and Its Use In Clinical Measurement", by Peter Atkinson et al, Academic Press, 1982, pp. 114-128.
Bonnefous Odile
Goujon Antoine
Kamm William E.
Manuel George
Slobod Jack D.
U.S. Philips Corporation
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