The attenuation of ultrasound in biological fluids

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Abstract
The ultrasonic attenuation parameters .alpha.0 and n of several biological fluids were measured in vitro in the frequency range 2.8-6.8 MHz, using frequency shift and/or a sinc (.cntdot.) sidelobe ratio technique. The parameters .alpha.0 and n describe the frequency-dependent attenuation via a power-law model, i.e., .alpha.(f) = .alpha.0fn, where f is frequency. The samples investigated were blood, pus, cyst fluid, bile and infected hematoma. It was found that the values of .alpha.0 span approximately the range between 0.03-0.3 dB cm-1 MHz-n, and values of n range from about 1.1-1.3.

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