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Related Experiment Videos

Quiet transverse gradient coils: Lorentz force balanced designs using geometrical similitude

R W Bowtell1, P Mansfield

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

Magnetic Resonance in Medicine
|September 1, 1995
PubMed
Summary

Active acoustic screening reduces MRI gradient coil noise. Applying this principle to fingerprint designs requires four cylinders for full magnetic screening and balanced forces.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Acoustic Engineering
  • Electromagnetism

Background:

  • Acoustic noise in MRI gradient coils is a significant issue.
  • Active acoustic screening is a novel method to mitigate this noise.
  • Gradient coil design impacts MRI performance and noise levels.

Purpose of the Study:

  • To apply the active acoustic screening principle to transverse distributed gradient coils.
  • To investigate the design requirements for fingerprint gradient coils incorporating active acoustic screening.
  • To determine the conditions for achieving Lorentz force balancing and Kirchhoff's law satisfaction.

Main Methods:

  • Utilized the principle of active acoustic screening.
  • Applied the principle to the design of transverse distributed gradient coils with a fingerprint configuration.

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  • Analyzed the electromagnetic and acoustic properties of the designed coil system.

    • Main Results:

    • The application of active acoustic screening to fingerprint gradient coils was explored.
    • It was found that a four-cylinder coil system is necessary for full active magnetic screening.
    • Complete Lorentz force balancing and exact Kirchhoff's law satisfaction necessitate this four-cylinder configuration.

    Conclusions:

    • A four-cylinder coil system is essential for achieving full active magnetic screening in fingerprint gradient coils.
    • This configuration ensures both Lorentz force balancing and adherence to Kirchhoff's law.
    • The findings provide critical design insights for advanced MRI gradient coil systems.