Surgery – Truss – Pad
Patent
1992-06-29
1994-07-26
Jaworski, Francis
Surgery
Truss
Pad
73625, A61B 800
Patent
active
053319630
ABSTRACT:
An apparatus for examining objects by ultrasonic echography includes an array of m ultrasonic transducer elements and a transmission stage having n transmission channels for causing n of the m transducer elements associated with an ultrasonic aperture to radiate echographic signals to the object and a receiving and processing stage having n receiving channels for receiving and processing echographic signals returned by the object being examined. The transmission and the receiving and processing stages include transmission-mode and receiving-mode circuits, respectively, for focusing by the provision of suitable focusing delays in the n channels of each. The receiving and processing stage includes a stage for determine after a first burst, (n-1)correction values for the focusing delays, and a circuit for correcting the focusing delays as a function of the (n-1) correction values thus determined. The stage for determining focusing delay correction values includes, in parallel, (n-1) correction determining circuits, each separately receiving two focused echographic signals in adjoining channels for determining a focusing delay correction value for one of the two channels.
REFERENCES:
patent: 4471785 (1984-09-01), Wilson et al.
patent: 4607218 (1986-08-01), Stosel
patent: 4817614 (1989-04-01), Hassler et al.
patent: 4989143 (1991-01-01), O'Donnell et al.
patent: 5184623 (1993-02-01), Mallart
patent: 5203336 (1993-04-01), Iida et al.
Jaworski Francis
Slobod Jack D.
U.S. Philips Corporation
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