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Imaging of Shear Waves Induced by Lorentz Force in Soft Tissues

P. Grasland-Mongrain, R. Souchon, F. Cartellier, A. Zorgani, J. Y. Chapelon, C. Lafon, and S. Catheline
Phys. Rev. Lett. 113, 038101 – Published 18 July 2014
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Abstract

This study presents the first observation of elastic shear waves generated in soft solids using a dynamic electromagnetic field. The first and second experiments of this study showed that Lorentz force can induce a displacement in a soft phantom and that this displacement was detectable by an ultrasound scanner using speckle-tracking algorithms. For a 100 mT magnetic field and a 10 ms, 100 mA peak-to-peak electrical burst, the displacement reached a magnitude of 1μm. In the third experiment, we showed that Lorentz force can induce shear waves in a phantom. A physical model using electromagnetic and elasticity equations was proposed. Computer simulations were in good agreement with experimental results. The shear waves induced by Lorentz force were used in the last experiment to estimate the elasticity of a swine liver sample.

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  • Received 14 January 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.038101

© 2014 American Physical Society

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New Medical Scan Requires Less Touching

Published 18 July 2014

A medical imaging technique uses electric and magnetic fields to generate vibrations in tissues and measure their mechanical stiffness in a new way.

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Authors & Affiliations

P. Grasland-Mongrain*, R. Souchon, F. Cartellier, A. Zorgani, J. Y. Chapelon, C. Lafon, and S. Catheline

  • Inserm, U1032, LabTau, Lyon F-69003, France and Université de Lyon, Lyon F-69003, France

  • *pol.grasland-mongrain@ens-cachan.org

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Issue

Vol. 113, Iss. 3 — 18 July 2014

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