Method and system for shimming an MRI magnet assembly
US6984982B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2002 |
| Grant date | Jan 10, 2006 |
| Priority date | — |
| Expiry date | Oct 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3873
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Described herein is a method and system for shimming an MRI magnetic field generating assembly, wherein a plurality of shims are secured relative to a surface of the magnetic field generating assembly to at least partially correct inhomogeneities in the magnetic field generated by the magnetic field generating assembly. In one aspect, the shims are arranged along a plurality of concentric geometric shapes each having at least five sides. In an alternative aspect, the shims are arranged in a plurality of rows and columns, where the rows are normal to the columns. In another aspect, at least one of the shims is a flat plate of magnetic material including a top edge, a bottom edge, side edges, and face surfaces. The bottom edge is the proximal portion of the flat plate relative to the magnetic field generating assembly, the top edge is the distal portion of the flat plate relative to the magnetic field generating assembly, and the face surfaces are aligned with a direction of the magnetic field generated by the magnetic field generating assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.