Superconducting magnet with refrigerator and magnetic resonance imaging apparatus using the same
US7714574B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2007 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Oct 28, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3804
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A superconducting magnet includes: a superconducting coil for generating a static magnetic field; a refrigerant container for containing the superconducting coil and a refrigerant; a vacuum container for holding the refrigerant container in a vacuum state; a radiation shield between the refrigerant container and the vacuum container; a refrigerator for re-liquidfying the refrigerant; and a dynamic magnetic field shield. The refrigerator includes: first and second regenerative refrigerants. The dynamic magnetic field shield is an electric good conductor and arranged around the first regenerative refrigerant along a motion axis of the first regenerative refrigerant, wherein a direction of the motion axis is aligned with a direction of a magnetic force line of the static magnetic field at the first regenerative refrigerant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.