Suppression of out-of-focus echoes in ultrasonic scanning

Details Suppression of out-of-focus echoes in ultrasonic scanning Suppression of out-of-focus echoes in ultrasonic scanning

G - Physics

01

S

349/47

G01S 15/00 (2006.01) G10K 11/32 (2006.01)

Patent

CA 1062360

Abstract of the Disclosure A method of reducing the echoes from reflectors disposed outside the focal line in an echo-sounding process using an ultrasonic field focusing in a focal line. The method comprises transmitting a pulsed ultrasonic wave having a cross-sectional area corresponding to one or more annular segments having a total azimuth angle of less than 360°, and receiving echoes from the spatial region corresponding to at least a part of other annular segments which compliment the annular segments of the cross-sectional area of the transmitted ultrasonic pulse to form a complete ring. Apparatus used for performing the method comprises an ultrasonic transducer system, a transmitter circuit for operating the transducer system, and a receiver circuit. The transducer system contains at least one transmitting and one receiving transducer each in the form of an annular segment, the radiation or receiving surfaces of the transducers being inclined to the axis of the ring.

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