Open permanent magnet structure for generating highly uniform fi

Details Open permanent magnet structure for generating highly uniform fi Open permanent magnet structure for generating highly uniform fi

1995-03-13

1996-02-27

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

H01F 702

Patent

active

054952220

ABSTRACT:
A hybrid permanent magnet structure for providing a uniform magnetic field within a region of interest while allowing access via open ends by a patient for NMR scanning and by a surgeon to the patient via a large opening at the top. The magnet structure comprises nested inner and outer magnetic structures separated by ferromagnetic material and surrounded by a ferromagnetic yoke. The inner magnetic sections comprise end blocks of triangular cross-section, and the outer magnetic sections comprise end blocks of trapezoidal cross-section. Field distortion compensating means is provided by a primary filter structure to the ferromagnetic material and by magnetic insertions or a secondary filter structure.

REFERENCES:
patent: 5049848 (1991-09-01), Pulyer
Manlio G. Abele, Structures of Permanent Magnets, John Wiley and Sons, New York, pp. 177-180 and 223-227, 1993.
Jensen JH, Abele, M. G., Effects of field orientation on field uniformity in permament magnet structures, J. Appl. Phys. 76(10), 6853-6855, 1994.
Manlio, G. Abele, Henry Rusinek, Field computation in permanent magnets with linear characteristics of magnetic media and ferromagnetic materials. Technical Report 24, New York University, pp. 1-21, Aug. 15, 1991.
Abele, M. G., Generation of highly uniform fields with permanent magnets. Technical Report No. 26, Department of Radiology, New York University School of Medicine, pp. 1-19, Jun. 15, 1994.
Abele, M. G., Generation of highy uniform fields with permanent magnets, (invited paper). J. Appl. Phys. 76(10), 6247-6252, 1994.
Abele, M. G., Jensen, J., Rusinek, H., Linear Theory of Pole Piece Design in Permanent Magnets. Proceedings of XIII International Workshop on Rare-Earth Magnets and Applications. CAF Manwaring, DGR Jones, AJ Williams and IR Harris, Eds, University of Brimingham, Edgbaston, United Kingdom, pp. 167-176, 1994.
P. B. Roemer, J. F. Schenck, F. A. Jolesz, E. T. Laskaris, R. W. Newman, S. M. Blumenfeld, K. G. Vosburgh, "A System for MRI-guided interventional procedures," Proceedings of IInd meeting; Society of Magnetic Resonance, vol. 1., p. 420.

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