Method and apparatus for measuring ultrasonic velocity by crosse

Details Method and apparatus for measuring ultrasonic velocity by crosse Method and apparatus for measuring ultrasonic velocity by crosse

1987-07-20

1989-04-18

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73597, 12866101, G01N 2904

Patent

active

048215740

ABSTRACT:
A measuring apparatus for an ultrasonic velocity in a region of interest within a medium includes an array transducer, and a velocity measuring circuit. The transducer is constructed of a plurality of transducer elements which are subdivided into at least first and second transmitting sections and first and second receiving sections with having a distance. First and second ultrasonic beams are emitted from the first and second transmitting sections to the ROI under the condition that the transmitting beam axis is intersected by the receiving ultrasonic beam axis. Then, the first and second receiver sections receives in total four echoes reflected from four corners of the ROI. The velocity measuring circuit calculates the propagation time of the ultrasonic beams and finally the ultrasonic velocity based upon the propagation time.

REFERENCES:
patent: 3388372 (1968-06-01), De Witz
patent: 4452081 (1984-06-01), Seppi
patent: 4653505 (1987-03-01), Iinuma
patent: 4682497 (1987-07-01), Sasaki
patent: 4700571 (1987-10-01), Okazaki
patent: 4716765 (1988-01-01), Hirama
IEEE Transactions on Ultrasonics Ferroelectrics, and Frequency Control, vol. UFFC-33, No. 4, Jul. 1986, pp. 359-368, IEEE, New York, U.S.; J. Ophir: "Estimation of the Speed of Ultrasound Propagation in Biological Tissues: A Beam-Tracking Method", p. 359, last line--p. 363, end of section III; pp. 363-367: section V and appendix*.
Japan Society of Ultrasonic Medicine (JSUM) Proceedings, Yoichi Sumino et al, 1986, p. 677, 5/1986.

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