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.
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