The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2002
Filed:
Feb. 28, 2001
Johannes Martinus van Oort, Niskayuna, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method for generating a ferromagnetic shim calibration file includes the steps of performing a computation of an analytical Finite Element solution of an internal magnetic field for each location where a shim is assumed to be present in an imaging volume of a magnet, performing a computation of an equivalent magnetic dipole moment of a shim with a saturated magnetization using the analytical Finite Element solution of the internal magnetic field, making a correction of the computation of the equivalent magnetic dipole moment of the shim to compensate for an aspect ratio for the shape of the shim, making another correction of the corrected computation of the equivalent magnetic dipole moment of the shim to compensate for a magnetic mirror effect in a pole-face of the magnet, and storing all computations and corrections for each shim in a shim calibration file.