Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1994-07-27
1995-08-29
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335297, 335298, 324320, G01V 300
Patent
active
054464340
ABSTRACT:
A magnet including spaced-apart first and second pole pieces with generally opposing first and second pole faces. The first pole face has an axis extending generally towards the second pole face and has a generally circular shim tray generally coaxially aligned with the axis and attached to the first pole face. The circular shim tray has shims each with a shape of generally a trapezoid when viewed facing the first pole face. The trapezoidal shaped shims may be arranged on the circumferences of imaginary concentric circles on the circular shim trays, with trapezoids on the same circumference having generally the same trapezoidal shape and with trapezoids on different circumferences having generally different trapezoidal shapes, to provide a smoother magnetic field to better reduce 3D (three-dimensional) magnetic field inhomogeneity.
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Concurrently filed patent application RD-23785, by Bizhan Dorri et al., entitled "Magnet Having Contoured Pole Faces for Magnetic Field Homogeneityh".
U.S. patent application Docket No. RD-23769FW, filed on or about Jul. 11, 1994, (Ser. No. not yet received) by M. V. Chari, entitled "Open (Non-Enclosed) Magnets for Magnetic Resonance Imaging".
U.S. patent application Ser. No. 08/067,183, filed May 26, 1993, by Dorri et al., entitled "Pole Face Design for a C-Shaped Superconducting Magnet".
Applicant's attached Statement of Facts.
Dorri Bizhan
Laskaris Evangelos T.
Ogle Michele D.
Barrera Raymond M.
Erickson Douglas E.
General Electric Company
Picard Leo P.
Webb II Paul R.
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