Ultrasonic examination apparatus

Details Ultrasonic examination apparatus Ultrasonic examination apparatus

1988-02-08

1989-07-04

Jaworski, Francis

Surgery

Truss

Pad

73599, A61B 800

Patent

active

048440825

ABSTRACT:
The present invention relates to an ultrasonic examination apparatus which transmits ultrasonic waves into a body to be examined and receives the echo signals therefrom for examination of the inside of the body. The ultrasonic examination apparatus measures acoustic characteristics such as nonlinear parameter within the body using the fact that the characteristic of the reception ultrasonic wave from the inside of the body is varied in accordance with variation of the characteristics within the body. The ultrasonic examination apparatus has first and second ultrasonic transducers for transmitting first ultrasonic pulse and second ultrasonic pulse, respectively. The frequency of the second ultrasonic pulse from the second ultrasonic transducer is higher than that of the first ultrasonic transducer. The first and second ultrasonic pulses are superimposed and transmitted into the body. The phase relation of the first and second ultrasonic pulses is controlled so that the modulation characteristic of the reception signal based on the non-linear effect assumes the maximum.

REFERENCES:
patent: 4610255 (1986-09-01), Shimura et al.
patent: 4633883 (1987-01-01), Matsui
patent: 4679565 (1987-07-01), Sasaki
patent: 4700571 (1987-10-01), Okazaki
patent: 4754760 (1988-07-01), Fukukita et al.
Journal of Statistical Physics, vol. 36, Nos. 5/6, 1984, pp. 779-786 by Bruce J. West et al.
Japanese Journal of Applied Physics/Supplement, vol. 26, Supplement 26-1, 1987, Proceedings of 7th Symposium on Ultrasonic Electronics, Kyoto, 1986, pp. 49-51, Tokyo, JP; H. Fukukita et al.: "Application of nonlinear effect to ultrasonic pulse reflection method--Modulation characteristics of received pulse".
Ultrasonic Imaging, vol. 7, 1985, pp. 49-59, Academic Press, Inc., New York, US; T. Sato et al.: "Nonlinear parameter tomography system using counterpropagating probe and pump waves".
Journal of the Acoustical Society of America, vol. 80, No. 1, Jul. 1986, pp. 28-32, Acoustical Society of America, New York, US; C. A. Cain: "Ultrasonic reflection mode imaging of the nonlinear parameter B/A: I. A theoretical basis".

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