Measurement of the acoustic nonlinearity parameterB/Ain human tissues by a thermodynamic method
作者:
Chandra M. Sehgal,
Robert C. Bahn,
James F. Greenleaf,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1984)
卷期:
Volume 76,
issue 4
页码: 1023-1029
ISSN:0001-4966
年代: 1984
DOI:10.1121/1.391420
出版商: Acoustical Society of America
关键词: phase velocity;temperature dependence;medium temperature;nonlinear acoustics;tissues
数据来源: AIP
摘要:
A thermodynamic method for measuring the acoustic nonlinearity parameterB/Ain tissues is presented. It is based on the measurement of change in phase velocity as a function of time as the hydrostatic pressure of the sample is quickly reduced from a known value. This technique circumvents the effect of the attenuation in the medium and does not require a prior knowledge of the thermodynamic parameters of the tissues. The method is used to estimate nonlinearity parameters for normal and malignant tissues in the temperature range 20° to 37 °C. The values and the temperature dependence of these parameters are found to vary with the nature of the tissues.
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