Three-dimensional optimal shape design of magnetic pole in permanent magnet assembly for MRI taking account of eddy currents due to gradient coil field

Three-dimensional optimal shape design of magnetic pole in permanent magnet assembly for MRI taking account of eddy currents due to gradient coil field

The ferromagnetic pole pieces of permanent magnet assembly for magnetic resonance imaging is optimally designed taking account of the pulse excited gradient coil field. In the design, the transient design sensitivity analysis is combined with the three-dimensional finite element method to give a sea...

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Veröffentlicht in:IEEE transactions on magnetics 2004-03, Vol.40 (2), p.1164-1167
Hauptverfasser: Yao, Y., Koh, C.S., Xie, D.
Format: Artikel
Sprache:eng
Schlagworte:
Assembly
Coils
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Eddy currents
Exact sciences and technology
Magnetic confinement
Magnetic flux
Magnetic properties and materials
Magnetic resonance imaging
Magnetism
Magnetostatics
Permanent magnets
Physics
Shape
Superconducting magnets
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Zusammenfassung:The ferromagnetic pole pieces of permanent magnet assembly for magnetic resonance imaging is optimally designed taking account of the pulse excited gradient coil field. In the design, the transient design sensitivity analysis is combined with the three-dimensional finite element method to give a search direction. The effects of the eddy currents, induced on the ferromagnetic pole pieces, on the main magnetic-field strength and homogeneity in diameter of interested region are also investigated.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2004.824576