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Passive magnetic screening.

E R Andrew1

  • 1Department of Physics, University of Florida, Gainesville 32611.

Magnetic Resonance in Medicine
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

Passive magnetic shielding for a 1.5-T whole-body magnet requires substantial iron, with material quantity largely independent of shield radius. Shield design depends on space and field uniformity needs.

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Area of Science:

  • Medical Physics
  • Applied Electromagnetism

Background:

  • Whole-body magnets, particularly 1.5-Tesla systems, necessitate effective magnetic shielding.
  • Passive magnetic shielding is crucial for containing stray magnetic fields and ensuring safety and performance.

Purpose of the Study:

  • To analyze the material requirements and design considerations for passive magnetic shields.
  • To evaluate the effectiveness of different shielding configurations and materials.

Main Methods:

  • Analysis of passive magnetic shielding principles for a 1.5-T whole-body magnet.
  • Consideration of shield geometry, material properties (iron, mu-metal), and multiple shield configurations.
  • Application of analytical solutions for cylindrical shields and numerical methods for complex shapes.

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Main Results:

  • Approximately 20 tons of iron are needed for a passive magnetic shield.
  • Shielding material quantity is largely independent of shield radius.
  • High-permeability materials like mu-metal have limited applications; multiple shields enhance performance but require careful spacing.

Conclusions:

  • Passive magnetic shield design involves trade-offs between material thickness, radius, space, and field uniformity.
  • Analytical and numerical methods can predict shield behavior for various geometries.
  • Shielding effectiveness is comparable for internal and external configurations.