Passive shimming by eliminating spherical harmonics coefficients of all magnetic field components generated by correction iron pieces

So Noguchi, Seokbeom Kim, Seungyong Hahn, Yukikazu Iwasa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

When a magnet generating highly homogeneous magnetic field is designed, a shimming is required. The shimming is usually performed so that the magnetic field only in the axis direction is compensated by iron pieces and/or coils. The compensation is commonly achieved by eliminating the coefficients of the spherical harmonics expansion of the magnetic field generated by the main magnet. Some papers showed the coefficients of the spherical harmonics expansion in only the z-direction for passive shimming. However, recently some magnets generate a magnetic field tilted from the z-axis, such as a magic-angle-spinning nuclear magnetic resonance/MRI. It is, therefore, necessary to eliminate the coefficients of the spherical harmonics expansion in the x-and y-direction.

Original languageEnglish
Article number6749021
Pages (from-to)605-608
Number of pages4
JournalIEEE Transactions on Magnetics
Volume50
Issue number2
DOIs
Publication statusPublished - Feb 2014

Keywords

  • MRI
  • Magnetic moment
  • nuclear magnetic resonance (NMR)
  • passive shimming
  • spherical harmonics expansion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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