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Sound generation in gradient coil structures for MRI

P Mansfield1, P M Glover, J Beaumont

  • 1Magnetic Resonance Centre, Department of Physics, University of Nottingham, University Park, United Kingdom.

Magnetic Resonance in Medicine
|April 16, 1998
PubMed
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This study explains how plastic plates in magnetic fields generate sound waves. New findings on acoustic interference patterns could help reduce noise in MRI gradient coils.

Area of Science:

  • Physics
  • Acoustics
  • Materials Science

Background:

  • Plastic plates subjected to Lorentz forces in magnetic fields generate acoustic waves.
  • Previous theory described the basic mechanism of sound generation.

Purpose of the Study:

  • To extend the theory of acoustic wave generation from plastic plates.
  • To detail the formation of acoustic interference patterns via Fraunhofer diffraction.
  • To investigate implications for noise reduction in Magnetic Resonance Imaging (MRI) gradient coils.

Main Methods:

  • Extended theoretical modeling of acoustic wave propagation and interference.
  • Analysis of acoustic signals, including frequency response and off-axis patterns.
  • Deduction of compressional wave velocities from experimental data.

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Main Results:

  • The extended theory accurately predicts acoustic signal variations with frequency.
  • Observed acoustic blazing with diffraction peaks inversely proportional to sound velocity.
  • Identified potential for noise reduction in MRI through coil arrangement and extended plate frequency response.

Conclusions:

  • The study provides a detailed understanding of acoustic wave generation and interference from vibrating plates.
  • Findings offer solutions for minimizing acoustic noise in MRI systems.
  • Compressional wave velocities were estimated for various plastic plates.