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Related Experiment Videos

Gradient coil design considerations for iron core interventional magnets

A Ersahin1, M J Bronskill, R M Henkelman

  • 1Department of Medical Biophysics, University of Toronto, Sunnybrook Health Science Centre, Imaging Research, Canada.

Journal of Magnetic Resonance Imaging : JMRI
|October 24, 1998
PubMed
Summary

This study investigated gradient coil designs for open MRI magnets, finding laminated pole pieces offer effective eddy current control without compromising patient access or imaging performance. This design enhances efficiency in interventional open-configuration magnets.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging Physics
  • Coil Design Engineering

Background:

  • Designing open-concept Magnetic Resonance Imaging (MRI) magnets involves balancing patient access with imaging performance requirements.
  • Gradient coils are crucial for MRI but can be affected by eddy currents, especially in open magnet designs.
  • Traditional shielded gradient coils can limit access, posing a challenge for interventional procedures.

Purpose of the Study:

  • To investigate gradient coil designs for open-concept MRI magnets.
  • To determine if solid versus laminated pole piece construction can control eddy currents effectively.
  • To assess the impact of design choices on patient access and gradient performance.

Main Methods:

  • Theoretical and experimental investigation of gradient coil design.

Related Experiment Videos

  • Comparison of solid and laminated pole piece construction.
  • Evaluation of eddy currents, gradient characteristics, efficiency, and magnet openness.
  • Utilized a compact, 0.27 Tesla (T) iron yoke magnet for analysis.

    • Main Results:

    • Laminated pole piece construction demonstrated adequate eddy current control.
    • The chosen design maintained good patient access and high gradient performance.
    • The resulting pole pieces and gradient coils exhibit high efficiency for open-configuration magnets.
    • Minimal space was required between poles, enhancing patient accessibility.

    Conclusions:

    • Laminated pole piece construction is a viable strategy for gradient coil design in open-concept MRI.
    • Effective eddy current control can be achieved without sacrificing patient access or gradient performance.
    • This approach optimizes design for interventional open-configuration MRI systems.