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Motion of a group of microparticles in a viscoelastic medium under the action of acoustic radiation force

  • Acoustics of Living Systems. Bioacoustics
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Abstract

We theoretically and experimentally substantiate the method of detecting microcalcifications in mammary gland tissue. Calcium salts accumulate in soft tissues, primarily forming clusters of individual microparticles. We study the motion of solid microparticles distributed in a viscoelastic medium. Displacement of particles is caused by the radiation force occurring as a consequence of energy scattering and absorption of an ultrasound beam focused in the particle region. The radiation force acts over the course of 200 μs, after which the medium with distributed particles relaxes to the initial state. Motion of the medium is tracked by the cross-correlation method with short probing pulses following at a frequency of 5 kHz. The presence of solid microparticles leads to a change in the character of motion of the medium after pulsed ultrasound action. The amplitude and duration of displacements increases in comparison to the homogeneous medium, and the motion character itself becomes significantly complicated.

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Authors and Affiliations

  1. Physics Faculty, Moscow State University, Moscow, 119991, Russia

    V. G. Andreev & A. V. Shanin

  2. Nizhni Novgorod State University, pr. Gagarina 23, Nizhni Novgorod, 603950, Russia

    V. G. Andreev, A. V. Shanin & I. Yu. Demin

Authors
  1. V. G. Andreev
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  2. A. V. Shanin
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  3. I. Yu. Demin
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Correspondence to V. G. Andreev.

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Original Russian Text © V.G. Andreev, A.V. Shanin, I.Yu. Demin, 2014, published in Akusticheskii Zhurnal, 2014, Vol. 60, No. 6, pp. 673–678.

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Andreev, V.G., Shanin, A.V. & Demin, I.Y. Motion of a group of microparticles in a viscoelastic medium under the action of acoustic radiation force. Acoust. Phys. 60, 704–709 (2014). https://doi.org/10.1134/S1063771014060013

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  • DOI: https://doi.org/10.1134/S1063771014060013

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