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Design and Dynamic In Vivo Validation of a Multi-Channel Stretchable Liquid Metal Coil Array.

Elizaveta Motovilova1,2, Terry Ching3,4,5, Jana Vincent6

  • 1Department of Radiology, Weill Cornell Medicine, New York, NY 10065, USA.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new multi-channel stretchable radiofrequency (RF) coil array for magnetic resonance imaging (MRI). The flexible coil improves image quality and enables dynamic knee imaging, enhancing patient comfort and diagnostic capabilities.

Keywords:
MRIRF coilliquid metalstretchable

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Materials Science

Background:

  • Traditional rigid radiofrequency (RF) coils in magnetic resonance imaging (MRI) limit patient comfort and dynamic imaging capabilities.
  • Previous work established a proof-of-concept for a single-element stretchable coil using liquid metal and self-tuning geometry.

Purpose of the Study:

  • To numerically analyze and experimentally validate a multi-channel stretchable RF coil array.
  • To assess the performance of the stretchable coil array compared to a commercial rigid coil array.
  • To demonstrate the application of the stretchable coil array in dynamic knee imaging.

Main Methods:

  • Numerical analysis of coil resonance frequency and sensitivity under various stretching conditions (0-30%).
  • Experimental validation of a multi-channel stretchable coil array.
  • Comparison of signal-to-noise ratio (SNR) between the stretchable and a commercial rigid coil array.
  • Acquisition of dynamic knee MRI at different flexion angles.

Main Results:

  • The stretchable coil array maintained resonance frequency (<1% variation) and sensitivity (<6%) across stretching configurations.
  • Experimental results showed up to a four-fold improvement in SNR with the stretchable coil array due to conformal fitting.
  • Successful dynamic knee imaging was achieved at various flexion angles, overcoming limitations of rigid coils.

Conclusions:

  • The developed multi-channel stretchable RF coil array offers a patient-friendly and high-performance solution for MRI.
  • The coil's design enhances image quality and enables previously infeasible dynamic imaging applications, particularly for knee joints.
  • This technology addresses key limitations of current rigid coil arrays, improving both patient comfort and diagnostic accuracy.