Naslov
Acoustic Streaming in Biological Fluids Measured Using an Ultrasonic Doppler Technique

Autori
Starritt, Hazel ; Duck, Francis ; Žauhar, Gordana

Izvornik
Journal of Ultrasound in Medicine S3 (1997); 71-71

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, sažetak sa skupa, znanstveni

Ključne riječi
streaming; ultrasound; blood; doppler

Sažetak
The aim was to investigate acoustic streaming in biological fluids. Little is known about this effect although it is important for safety reasons and potentially as a diagnostic tool. Fluids were insonated using 3.5 MHz single element transducer in pulsed mode with a total acoustic power of 150 mW. Streaming was detected using a 8 MHz continious wave Doppler system and the maximum velocity was obtained by spectral analysis of the Doppler signal. Axial profiles were measured for propagation (a) through water plus 3 cm of test fluid and (b) purely in test fluid. For each fluid the harmonic content in the acoustic pulse was assesed using a pvd needle hydrophone. The maximum streaming velocity in the water was 8.2 cms^-1. In the fluid samples plus water, the maximum velocities were 5.8 cms^-1 in 4.5% human serum Albumen (HSA) and 4.7 cms^-1 in blood. Velocities were similar in HSA alone but lower in blood. Using a commercial Duplex scanner, streaming was generated and detected in blood and HSA. Maximum streaming velocities are lower in biological fluids than in water, in spite of its low attenuation. This is due in part to reduced harmonic generation in these fluids compared with water.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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