Influence of absorption and scattering on the velocity of acoustic streaming

• Autorzy: Secomski W. , Wójcik J. , Klimonda Z. , Olszewski R. , Nowicki A.
• Języki publikacji: EN

Abstrakty

EN

Streaming velocity depends on intensity and absorption of ultrasound in the media. In some cases, such as ultrasound scattered on blood cells at high frequencies, or the presence of ultrasound contrast agents, scattering affects the streaming speed. The velocities of acoustic streaming in a blood-mimicking starch suspension in water and Bracco BR14 contrast agent were measured. The source of the streaming was a plane 20MHz ultrasonic transducer. Velocity was estimated from the averaged Doppler spectrum. The single particle driving force was calculated as the integral of the momentum density tensor components. For different starch concentrations, the streaming velocity increased from 8.9 to 12.5mm/s. This corresponds to a constant 14% velocity increase for a 1 g/l increase in starch concentration. For BR14, the streaming velocity remained constant at 7.2mm/s and was independent of the microbubbles concentration. The velocity was less than in reference, within 0.5mm/s measurement error. Theoretical calculations showed a 16% increase in streaming velocity for 1 g/l starch concentration rise, very similar to the experimental results. The theory has also shown the ability to reduce the streaming velocity by low-density scatterers, as was experimentally proved using the BR14 contrast agent.

Słowa kluczowe

EN

ultrasound; radiation force; starch; contrast agent; blood; thrombolysis

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2017
• Tom: Vol. 20
• Strony: 159--168
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Secomski W.

• Department of Ultrasound, Institute of Fundamental Technological Research Polish Academy of Sciences Pawińskiego 5B, 02-106 Warszawa, Poland

autor

Wójcik J.

• Department of Ultrasound, Institute of Fundamental Technological Research Polish Academy of Sciences Pawińskiego 5B, 02-106 Warszawa, Poland

autor

Klimonda Z.

• Department of Ultrasound, Institute of Fundamental Technological Research Polish Academy of Sciences Pawińskiego 5B, 02-106 Warszawa, Poland

autor

Olszewski R.

• Department of Ultrasound, Institute of Fundamental Technological Research Polish Academy of Sciences Pawińskiego 5B, 02-106 Warszawa, Poland

autor

Nowicki A.

• Department of Ultrasound, Institute of Fundamental Technological Research Polish Academy of Sciences Pawińskiego 5B, 02-106 Warszawa, Poland

Bibliografia

• [1] W.L. Nyborg, Acoustic streaming, in W.P. Mason, ed., Physical acoustics, IIB, Academic Press, 265-331, New York 1965.
• [2] S. Tjotta S, On some non-linear effects in sound fields with special emphasis on generation of vorticity and the formation of streaming patterns, Arch.Math. Naturvidensk., 55, 1-68, 1959.
• [3] L. Filipczynski, R. Herczynski, A. Nowicki, T. Powalowski, Przepływ krwi, 67- 102, Państwowe Wydawnictwo Naukowe, Warszawa 1980.
• [4] J. Szabatin, Podstawy teorii sygnałów, Wydawnictwa Komunikacji i Łączności, 245-346, Warszawa 2000.
• [5] S. Ricci, R. Matera, P. Tortoli, An improved Doppler model for obtaining accurate maximum blood velocities, Ultrasonics 54 (7): 2006–2014, 2014.
• [6] T. Yoshida, K. Tanaka, K. Sato, T. Kondo, K. Yasukawa, N. Miyamoto, M. Taniguchi, Blood-Mimicking Fluid for the Doppler Test Objects of Medical Diagnostic Instruments, 2012 IEEE International Ultrasonics Symposium, DOI: 10.1109/ULTSYM.2012.0403, 1-4, 2012.

Uwagi

PL

Opracowanie w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).