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Related Experiment Video

Updated: Feb 6, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Multiple sources array controls shear-wave field in soft tissue using time reversal.

C Zemzemi1,2,3, J Aichele1,2, S Catheline1,2

  • 1LabTau, Inserm, U1032, Lyon, F-69003, France.

Physics in Medicine and Biology
|August 29, 2018
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Summary

This study demonstrates a novel multi-source method using time reversal to enhance shear-wave elastography (SWE). This technique significantly improves signal-to-noise ratio for better deep tissue imaging.

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Medical Imaging

Background:

  • Shear-wave elastography (SWE) typically uses single sources for shear wave generation.
  • Improving signal-to-noise ratio (SNR) is crucial for accurate deep tissue characterization in SWE.
  • Controlled multi-source shear wave emission offers potential for enhanced SWE performance.

Purpose of the Study:

  • To investigate the feasibility of controlling shear wave fields using multiple sources.
  • To enhance the signal-to-noise ratio (SNR) in shear-wave elastography.
  • To demonstrate the application of this technique for deep tissue imaging and bone conduction.

Main Methods:

  • Experiments utilized six shakers with independent driving electronics in a gelatin-graphite phantom.
  • A time-reversal approach was employed to control shear wave propagation in space and time.
  • The multi-source array was applied to a skull model to observe shear wave focusing in a brain tissue phantom.

Main Results:

  • Controlled shear wave fields with multiple focal spots at chosen locations were achieved.
  • The signal-to-noise ratio was improved by 10 dB compared to single-source methods.
  • Shear wave focusing was experimentally observed in a soft brain tissue-mimicking phantom through a skull model, demonstrating bone conduction capability.

Conclusions:

  • Time reversal with multiple sources is an effective adaptive filter for improving SNR in SWE.
  • This method allows for precise control of shear wave energy delivery to deep tissue regions.
  • The technique shows promise for non-invasive imaging and therapeutic applications, including through bone conduction.