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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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3D MR elastography at 0.55 T: Concomitant field effects and feasibility.

Omar Isam Darwish1,2, Pierluigi Di Cio1, Ralph Sinkus1,3

  • 1Research Department of Imaging Physics and Engineering, School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.

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Summary

This study shows that 3D MR elastography (MRE) is feasible in the liver at 0.55 Tesla, providing comparable results to higher field strengths. These findings support the use of lower-field MRE for liver stiffness assessment.

Keywords:
Hadamard encodingMR elastographyconcomitant fieldsliverlow field MR

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Biomedical Engineering

Background:

  • Magnetic Resonance Elastography (MRE) assesses tissue stiffness.
  • Lower magnetic field strengths (0.55 T) offer potential advantages in cost and accessibility.
  • Assessing hepatic (liver) biomechanical properties is crucial for diagnosing liver diseases.

Purpose of the Study:

  • To evaluate the feasibility of 3D MRE at 0.55 T for liver imaging in healthy volunteers.
  • To investigate the impact of concomitant magnetic fields on MRE at 0.55 T.
  • To compare MRE-derived biomechanical parameters at 0.55 T with those obtained at 3 T.

Main Methods:

  • Numerical simulations and phantom experiments were used to assess concomitant field effects.
  • A Hadamard-encoded 3D MRE sequence was applied at 0.55 T in five healthy volunteers.
  • A reference 3D MRE scan at 3 T was performed for comparison, analyzing shear modulus, wave speed, and loss modulus.

Main Results:

  • Concomitant field effects were found to be negligible at 0.55 T.
  • Biomechanical parameters (|G*|, Cs, G″) at 0.55 T showed good agreement with 3 T measurements.
  • A 2.1-fold decrease in apparent signal-to-noise ratio (SNR) was observed at 0.55 T compared to 3 T.

Conclusions:

  • Hepatic 3D MRE is feasible and demonstrates promising results at 0.55 T.
  • Lower-field MRE can provide reliable biomechanical parameter estimations.
  • Further research can explore the clinical utility of 0.55 T MRE for liver disease assessment.