Measuring method and apparatus for non-linear parameter of acous

Surgery – Truss – Pad

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128736, 374117, 73602, A61B 1000, G01N 2900

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active

045664609

ABSTRACT:
A measuring method and apparatus for measuring a non-linear parameter of an acoustic medium or its distribution, and the application of the parameter to the measurement of internal temperature of a sample noninvasively. A continuous wave ultrasonic probing beam is radiated through the sample, and a pumping wave which is an ultrasonic pulse is superposed on the probing beam. A phase change in the probing beam caused by the pumping wave is detected. From this phase change the non-linear parameter (B/A) is obtained. The invention projects two methods. The first method provides the pumping wave in a direction intersecting the probing beam. The second method projects the pumping wave in a direction along the probing beam in counter direction. From the information concerning the variation of measured value of (B/A), the inner temperature of the sample is obtained. The invention makes it possible to measure the non-linear parameter or temperature which was impossible in the prior art.

REFERENCES:
patent: 4431008 (1984-02-01), Warner et al.
Papers by Ichida et al., pp. 59-67, 1982.
"Real-Time Nonlinear Parameter Tomography Using Impulsive Pumping Waves", IEEE Transactions on Sonics and Ultrasonics, vol. SU-31, No. 6, Nov. 1984, pp. 635-641.
"Imaging the Nonlinear Ultrasonic Parameter of a Medium", Ultrasonic Imaging 5, 1983, pp. 295-299.
"Prediction of Nonlinear Acoustic Effects at Biomedical Frequencies and Intensities", T. G. Muir et al., Ultrasound in Med. and Biol., pp. 345-357, Great Britain, 1980.

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