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A compact permanent magnet array with a remote homogeneous field.

Andrew E Marble1, Igor V Mastikhin, Bruce G Colpitts

  • 1MRI Centre, Department of Physics, P.O. Box 4400, University of New Brunswick, Fredericton, NB, Canada E3B 5A3.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 24, 2007
PubMed
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We developed a compact magnet array producing a homogeneous magnetic field with a unique

Area of Science:

  • Physics
  • Engineering
  • Biomedical Imaging

Background:

  • Homogeneous magnetic fields are crucial for various scientific applications, including magnetic resonance imaging (MRI).
  • Existing magnet designs often face limitations in terms of size, weight, or field orientation.
  • The development of specialized magnetic field generators is essential for advancing imaging technologies and improving signal-to-noise ratio (SNR).

Purpose of the Study:

  • To design and construct a novel single-sided magnet array.
  • To generate a homogeneous static magnetic field (B(0)) with a localized 'sweet spot'.
  • To orient the magnetic field parallel to the array surface for enhanced measurement capabilities.

Main Methods:

  • A compact single-sided magnet array was designed and constructed.

Related Experiment Videos

  • The array's dimensions are 11.5 cm x 10 cm x 6 cm, weighing approximately 5 kg.
  • The magnetic field properties, including spatial derivatives, were analyzed to identify the 'sweet spot'.

    • Main Results:

    • The magnet array successfully generates a homogeneous B(0) field.
    • A 'sweet spot' with near-zero first and second spatial derivatives was identified 1 cm above the array surface.
    • The B(0) field is oriented parallel to the array surface, a key design feature.

    Conclusions:

    • The developed magnet array offers a compact and efficient solution for generating a homogeneous magnetic field.
    • The parallel field orientation enables the use of ordinary surface coils for unilateral measurements.
    • This design holds significant potential for dramatic improvements in signal-to-noise ratio (SNR) for specific applications.