Sound Speed Measurement of Chicken Liver from 22°C to 60°C

Abstract Soft tissue acoustic characterization has been widely explored in order to understand the ultrasonic bio-effects. Speed of sound and attenuation are the most frequently measured parameters. In hyperthermia and ablation applications, tissue temperature increases due to ultrasound exposure. Sound speed temperature dependence of 10 chicken liver samples was measured in order to obtain its behavior at hyperthermia temperature interval. Pulse-echo technique was used for measuring the ultrasound speed of the tissue sample. Sound speed measurement in chicken liver at 21.8 C was 1588.2 m/s, while at 60.5 C was 1609.3 m/s. With these results, we proposed a 5 th order polynomial to fit the curve described by the ultrasound velocity temperature dependence in chicken liver of the form c liver =2.664e -6 T 5 -0.000536T 4 +0.04192T 3 -1.615T 2 +31.76T+1337 , where c liver is sound speed in chicken liver and T is the temperature. It is clear that more experimentation is needed in order to have final results.