NUMERICAL STUDIES OF THE SPECTRUM OF LOW-INTENSITY ULTRASOUND SCATTERED BY BUBBLES

Authors
  1. Eatock, B.C.
  2. Nishi, R.Y.
  3. Johnston, G.W.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Toronto Univ, Toronto ONT (CAN) Inst for Aerospace Studies
Abstract
The magnitude of the nonlinear effect in the scattering of ultrasound by nitrogen bubbles in water is examined numerically, for ultrasonic frequencies and amplitudes typical of diagnostic medical devices, to determine the suitability of this effect for the detection of bubbles in blood or tissue for application in decompression research. Numerical solutions of the modified "Rayleigh" equation, including the effects of acoustic, thermal, and viscous damping, and the dependence of the polytropic exponent on frequency are presented for pulsed ultrasound. For the chosen conditions, it is shown that nonlinear scattering is significant only for the population of bubbles which are smaller than, or close to, resonance size, and primarily for those bubbles that are one-half resonance size.
Report Number
85-P-04 — Research Paper
Date of publication
01 Jan 1985
Number of Pages
11
Reprinted from
J Acoust Soc Am, vol 77, no 5, 1985, p 1692-1701
DSTKIM No
85-02418
CANDIS No
47218
Format(s):
Hardcopy;Originator's fiche received by DSIS

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