Variable focus transducer

Details Variable focus transducer Variable focus transducer

A - Human Necessities

61

B

349/36

A61B 8/00 (2006.01) A61B 8/08 (2006.01) G01N 29/00 (2006.01) G01N 29/26 (2006.01) G01S 7/52 (2006.01) G10K 11/32 (2006.01) G10K 11/34 (2006.01)

Patent

CA 1201197

ABSTRACT OF THE DISCLOSURE Apparatus for the ultrasonic examination of an object, e.g. in medical diagnosis, has an arrangement for transmitting pulses of ultrasonic energy into the object and for receiving echoes of the pulses reflected by acoustic impedance discon- tinuities within the object, the arrangement comprising a mechanically prefocused transducer array comprising a central transducer element, the beam axis of the array lying along a line through the center of the central element at right angles thereto, and a plurality of annular transducer elements posi- tioned concentrically of said beam axis; and electronic com- ponents for varying the focus of the transducer array during transmission of the pulses into the object and receipt of the echoes, the transducer array having a spherically curved surface.

260604

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