Ultrasonic pulse temperature determination method and apparatus

Details Ultrasonic pulse temperature determination method and apparatus Ultrasonic pulse temperature determination method and apparatus

1987-03-30

1988-07-05

Jaworski, Francis J.

Surgery

Truss

Pad

128736, 73599, 374117, A61B 1000, G01N 2900

Patent

active

047547600

ABSTRACT:
A first ultrasonic pulse formed by the superposition of a probe pulse on a pump pulse having a frequency lower than the center frequency of the ultrasonic probe pulse where the particle velocity of the pump pulse is in the vicinity of zero in addition to which the particle acceleration of which is at a constant portion, and a second pulse formed by the superposition of the probe pulse center frequency on the peak particle velocity portion of the pump pulse, as well as a probe pulse alone, are transmitted into a specimen before and after it is heated and the reflections of the transmitted signals from two or more reflecting points that are at different depths in the specimen are received. The received signals are subjected to frequency analysis and the spectral shift and the phase shift of the probe pulse and superposed pulses are obtained, and from these values the attenuation of the probe pulse between the differing depths is determined. Such an attenuation determination is obtained before and after heating of the specimen and the change in temperature of the specimen is determined from the obtained attenuation values on the basis of a pre-prepared table of changes in attenuation factor in accordance with changes in the temperature of the specimen.

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Sachs, T. D. et al "TAST: A Non-Invasive Tissue Analytic System", NBS Publ. 453, Proc. of Seminar on Ultrasonic Tissue characterization held at NBS, Gaithesburg, MD, May 28-30, 1975 (issued Oct. 1976).

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