Toward real-time shear-wave imaging

Ultradense magnetic sources enable rapid diffuse field correlations

Journal Article (2024)
Author(s)

G. Laloy-Borgna (Université Claude Bernard Lyon 1, TU Delft - ImPhys/Renaud group)

Bruno Giammarinaro (Université Claude Bernard Lyon 1)

Z. Sun (Beijing University of Technology)

S. Catheline (Université Claude Bernard Lyon 1)

J. Aichele (Université Claude Bernard Lyon 1, ETH Zürich)

Research Group
ImPhys/Renaud group
DOI related publication
https://doi.org/10.1103/PhysRevApplied.22.064061
More Info
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Publication Year
2024
Language
English
Research Group
ImPhys/Renaud group
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.@en
Issue number
6
Volume number
22
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Abstract

Perfectly diffuse wave fields are the underlying assumption for noise-correlation tomography in seismology, nondestructive testing, and elastography; however, perfectly diffuse fields are rarely encountered in real-world applications. We show that homogeneously distributed magnetic microparticles allow instantaneous generation of a diffuse wave field, which can be imaged using a clinical probe connected to a fully programmable ultrasound scanner. The particles are placed inside a bilayered hydrogel and act as elastic-wave sources on excitation by a magnetic pulse. Using ultrafast ultrasound imaging coupled to phase tracking, the diffuse elastic wave field is imaged. This allows the local wave velocity to be measured everywhere on the image using noise-correlation algorithms inspired by seismology. Thanks to this instantaneous diffuse wave field, a very short acquisition time is sufficient to retrieve the wave speed contrast of a bilayered phantom. The correlation time window can be shrunk down to three time samples, which we show in a numerical simulation mimicking the experimental conditions. Our experimental and numerical results are consistent with theoretical predictions made by information theory, and they pave the way for real-time elasticity imaging. This is of particular interest for monitoring of medical treatments through real-time tissue-elasticity assessment, and it is also applicable in related fields such as seismology and nondestructive testing.

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