Radiation force and shear motions in inhomogeneous media

Lev Ostrovsky, Alexander Sutin, Yuri Il'inskii, Oleg Rudenko, Armen Sarvazyan

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

An action of radiation force induced by ultrasonic beam in waterlike media such as biological tissues (where the shear modulus is small as compared to the bulk compressibility) is considered. A new, nondissipative mechanism of generation of shear displacement due to a smooth (nonreflecting) medium inhomogeneity is suggested, and the corresponding medium displacement is evaluated. It is shown that a linear primary acoustic field in nondissipative, isotropic elastic medium cannot excite a nonpotential radiation force and, hence, a shear motion, whereas even smooth inhomogeneity makes this effect possible. An example is considered showing that the generated displacement pulse can be significantly longer than the primary ultrasound pulse. It is noted that, unlike the dissipative effect, the nondissipative action on a localized inhomogeneity (such as a lesion in a tissue) changes its sign along the beam axis, thus stretching or compressing the focus area.

Original languageEnglish
Pages (from-to)1324-1331
Number of pages8
JournalJournal of the Acoustical Society of America
Volume121
Issue number3
DOIs
StatePublished - 2007

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