Harmonic ultrasound beams forming by means of radiating source parameters

• Autorzy: Kujawska T. , Wójcik J.
• Języki publikacji: EN

Abstrakty

EN

In the paper the investigation results of the influence of such parameters as shape and size of the radiating source, as well as waveform, frequency and amplitude of the propagating pulse on the non-linear ultrasonic beam forming are presented. The analysis was carried out on the basis of numerical simulations of the amplitude and harmonic field distributions, in space and time, of two-dimensional beams propagating in water. The applied software (numerical solver), describing the nonlinear propagation of the ultrasonographic pulse wave radiated by the axially symmetrical source in the layered lossy medium for given boundary conditions, was used as the tool to predict the behavior of the ultrasound beam. The algorithm of the above numerical solver, proposed by the second author, is based on the frequency-domain numerical solution of the non-linear wave equation for finite amplitude sound beams. It takes into account the influence of the effects of diffraction, non-linearity and thermoviscous absorption on the propagation of the finite amplitude acoustic beam in attenuating media.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2004
• Tom: Vol. 7
• Strony: 135--142
• Opis fizyczny: Bibliogr. 4, rys., tab.

Twórcy

autor

Kujawska T.

• Ultrasound Department, Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw, Poland

autor

Wójcik J.

• Ultrasound Department, Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw, Poland

Bibliografia

• [1] L. Filipczyński, T. Kujawska, R. Tymkiewicz, J. Wójcik, Nonlinear and linear propagation of diagnostic ultrasound pulses, Ultrasound in Med. & Biol., 25, 285- 299,1999.
• [2] T. Kujawska, A new method for determination of the acoustic non-linearity parameter B/A in multi-layer biological media, Proc. of the World Congress on Ultrasound, 81-84, 2003.
• [3] J. Wójcik, A new theoretical basis for numerical simulations of nonlinear acoustic fields, Proceedings of the 15th ISNA, Ed. Am. Soc. of Physics, 524, 141-144, 2000
• [4] M.C. Ziskin, P.A. Lewin, Ultrasonic exposimetry, CRC Press Inc., 320-323, 1993.