Radiation force in nonlinear, focused beams

The effect of cumulative nonlinear distortions in a focused ultrasonic wave on the dissipative radiation force (RF) is analyzed using a simplified analytical model separating the stages of geometrical focusing and the subsequent diffraction in the focal area. It is shown that in the absence of shock...

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Bibliographic Details
Published inThe Journal of the Acoustical Society of America Vol. 124; no. 3; p. 1404
Main Author Ostrovsky, L A
Format Journal Article
LanguageEnglish
Published United States 01.09.2008
Subjects
Body Fluids - chemistry
Elasticity
Models, Theoretical
Nonlinear Dynamics
Scattering, Radiation
Ultrasonics
Viscosity
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Summary:The effect of cumulative nonlinear distortions in a focused ultrasonic wave on the dissipative radiation force (RF) is analyzed using a simplified analytical model separating the stages of geometrical focusing and the subsequent diffraction in the focal area. It is shown that in the absence of shocks, nonlinear steepening can significantly amplify the RF as compared with a harmonic wave. Two different types of dissipation, one corresponding to a classical viscous fluid and another typical of many biological tissues, are considered.
ISSN:1520-8524
DOI:10.1121/1.2956473