Acoustical Nonlinear Parameter and Sound Speed Characteristics of Human Fat Tissues

Acoustical nonlinear parameter B/A (adiabatic), (B/A)’ (isothermal), sound speed c and density P measurements in the temperature range of 2OoC to 37OC have been made in excised fat tissues obtained from different parts of the human body. Magnitudes of temperature coefficients of sound speed and difference between adiabatic and isothermal values of B/A correlated highly with water content of the tissue. A reciprocal relationship between B/A and c was observed in soft tissues. In contrast, a linear relationship between B/A and c was observed in protein solutions. No correlation has been found either with B/A or with c with the age of the person from whom the fat tissues were obtained.