engleski

Acoustic streaming in biological fluids

A method of investigating streaming in biological fluids is reported. A number of fluids were insonated using a 3.5 MHz single element diagnostic sonar transducer which was driven in pulsed mode with a total acoustic power of 150mW. Streaming was detected in each fluid using an 8 MHz continuous wave Doppler system and the maximum streaming velocity was obtained by spectral analysis of the Doppler signal. Using this system streaming was observed in water and 4.5% human serum albumen (HSA) solution, to both of which sephadex had been added as a scattering material, and also in blood. The maximum streaming velocities detected were: 9.3 cms-1 in water, 6.8 cms-1 in HSA and 4.9 cms-1 in blood. Streaming was also observed to occur in these fluids using a modern commercial Duplex scanner operating in pulsed Doppler mode. The observation that streaming values were greatest in water, in spite of its low attenuation, was attributed to the high degree of non-linearity.

biological fluids; streaming; acoustic; Doppler signal; spectral analysis

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