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Gradient coil design using active magnetic screening.

R Bowtell1, P Mansfield

  • 1Department of Physics, University of Nottingham, United Kingdom.

Magnetic Resonance in Medicine
|January 1, 1991
PubMed
Summary
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Active magnetic screening enables the creation of gradient coils that are magnetically isolated. This technology effectively eliminates eddy current issues in rapidly switched magnetic resonance imaging gradients.

Area of Science:

  • Physics
  • Magnetic Resonance Imaging (MRI) Engineering

Background:

  • Gradient coils in MRI generate magnetic fields for spatial encoding.
  • Rapidly switching gradients induce eddy currents, causing signal distortions and limiting performance.
  • Existing coils often suffer from magnetic interference with surrounding components.

Purpose of the Study:

  • To introduce and explain the principles of active magnetic screening for gradient coils.
  • To describe design methodologies for actively screened gradient coils.
  • To address practical construction challenges of these specialized coils.

Main Methods:

  • Outline the fundamental physics behind active magnetic screening.
  • Detail various design approaches for screened gradient coils.

Related Experiment Videos

  • Discuss material selection and fabrication techniques.

    • Main Results:

    • Active screening decouples gradient coils from their environment.
    • Elimination of eddy current problems associated with rapid gradient switching.
    • Enables the production of high-performance gradient coils within confined spaces.

    Conclusions:

    • Active magnetic screening is a viable solution for mitigating eddy current effects in MRI gradient coils.
    • The described design and construction methods facilitate the development of advanced MRI systems.
    • This technology enhances image quality and performance in demanding MRI applications.