Theoretical model for the threshold onset of contrast microbubble oscillations.
It has been reported recently through high speed optical observations of phospholipid-coated contrast microbubbles that there is a threshold value for the acoustic pressure amplitude below which the radial oscillation of the microbubbles does not occur. In this Letter, it is suggested that this threshold behavior results from the fact that a phospholipid layer, as a physical material, has a certain value of the limiting shear stress so that its deformation does not start until this limiting value is exceeded. A theoretical model is proposed for the description of this phenomenon. The model explains the experimentally observed dependence of the threshold onset of microbubble oscillation on the initial bubble radius.
INSERM U930 CNRS ERL 3106, Universite Francois Rabelais, CHU Bretonneau, 2 Boulevard Tonnelle, 37044 Tours Cedex 9, France. doinikov@bsu.by
Alexander A
AA
Doinikov
Ayache
A
Bouakaz