A thermodynamic method for measuring the acoustic nonlinearity parameter B/A in 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 degree to 37 degree C. The values and the temperture dependence of these parameters are found to vary with the nature of the tissues.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of the Acoustical Society of America|
|State||Published - Oct 1984|
ASJC Scopus subject areas
- Acoustics and Ultrasonics