Journal ArticleDOI
Damping Constants of Pulsating Bubbles
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TLDR
In this article, the damping constants of resonant bubbles are extended to the off-resonance case and it is shown that thermal damping is important for bubbles driven below resonance, and radiation damping for those above resonance.Abstract:
Results obtained by Devin [J. Acoust. Soc. Amer. 31, 1654–1667 (1959)] for the damping constants of resonant bubbles are extended to the off‐resonance case. Calculated results show for the range of conditions considered that thermal damping is important for bubbles driven below resonance, and radiation damping is important for those above resonance.read more
Citations
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Journal ArticleDOI
Subharmonic backscattering from ultrasound contrast agents.
TL;DR: It is predicted that subharmonic generation in contrast agents requires a threshold insonifying pressure, and should be a minimum when microspheres are insonated at twice their resonance frequency, and experiments confirm the existence of this optimum incident frequency and of a reasonably low threshold pressure.
Journal ArticleDOI
Monopole emission of sound by asymmetric bubble oscillations. Part 2. An initial-value problem
TL;DR: In this article, it was shown that a general initial distortion of the bubble, with no initial volume change, can be resolved into normal modes each of which radiates independently, and the zero-order "breathing mode" is stimulated also.
Journal ArticleDOI
On the spatial distribution of ocean bubbles
G. B. Crawford,D. M. Farmer +1 more
TL;DR: In this article, the vertical and horizontal distribution of clouds is discussed in terms of wave-breaking processes, air-sea temperature differences, and subsurface motions which are thought to modulate the bubble concentration.
Journal ArticleDOI
The intensity dependence of lesion position shift during focused ultrasound surgery.
TL;DR: For accurate modelling of heating during FUS, nonlinear effects should be considered and a first order approximation has been employed that attempts to account for the abnormal heat deposition distributions that accompany high transducer drive level FUS exposures where cavitation and boiling may be present.
Journal ArticleDOI
Gauging the likelihood of stable cavitation from ultrasound contrast agents
TL;DR: The mechanical index (MI) was formulated to gauge the likelihood of adverse bioeffects from inertial cavitation but did not consider bubble activity from stable cavitation, which can be readily nucleated from ultrasound contrast agents (UCAs) and has the potential to promote beneficial bioeffects.