Patent ID: 8947089
Filing Date: 2015-02-03
Classification: A61B,G01R,H01F

Abstract:
1. A magnetic field adjustment method of reducing an error magnetic component in a region of a magnetic field generated by either: a magnetic field generation device, a superconducting magnet apparatus, a nuclear magnetic resonance tomographic apparatus, or an apparatus performing magnetic resonance imaging with the magnetic field adjustment method comprising: measuring a magnetic field distribution of the magnetic field generated by the magnetic field generation device at a plurality of nodes on a predetermined surface; calculating an error magnetic field that is represented by a difference from the measured magnetic field distribution and a target magnetic field distribution; selecting one or more eigen-distribution functions from among a plurality of eigen-distribution functions that are obtained by singular value decomposition; obtaining a current potential distribution on a magnetic field adjustment mechanism in order to approximately correct the error magnetic field according to the selected eigen-distribution functions; converting the obtained current potential distribution into magnetic moments at the nodes; and arranging at least one of: