Matrix shim system with grouped coils
US7330031B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2006 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | Aug 21, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3875
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A matrix shim system for generating magnetic field components superimposed on a main static magnetic field, comprising a plurality of annular coils, is characterized in that it comprises g groups G1 . . . Gg of coils, with g being a natural number ≧1, wherein each group Gi consists of at least two single annular coils connected in series, wherein each group Gi is designed to generate, in use, a magnetic fieldFor each group Gi, there are at least two values of n for whichwith N: the total number of current supplies of the matrix shim system, and R: smallest inside radius of any of the annular coils of the matrix shim system. An individual, adjustable electrical current supply is provided for each group Gi of coils. The inventive matrix shim system is both simple in design and stable against current fluctuations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.