Method and apparatus for compensating for drift in magnetic field strength in superconducting magnets
US9213073B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 2014 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Jun 15, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F6/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An MRI system has a cylindrical superconducting magnet assembly contained in a bore tube of a cylindrical vacuum vessel (OVC), and a gradient coil assembly situated within the OVC bore tube. In an imaging region within a bore of the gradient coil assembly, the magnet assembly produces a magnetic field that is subject to drift during operation of the MRI system. Compensating material is located at a radial position between the imaging region and the magnet in a location that will be heated over a range of temperatures during operation of the MRI system. The compensating material is adjustable between two magnetic phases in response to an applied physical characteristic, which is selectively applied thereto so as to change the compensating material from a first magnetization to a second magnetization, and thereby compensate the drift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.