Active shield superconducting electromagnet apparatus and magnetic resonance imaging system
US7990661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2008 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jul 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/288
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The active shield superconducting electromagnet apparatus includes: a main switching circuit in which first and second main coils, first and second shield coils, and a first superconducting persistent current switch are connected in series; a sub switching circuit in which a bypass circuit, in which a superconducting fault current limiter and a second superconducting persistent current switch are connected in series, are connected to a series circuit of the first main coil and the second main coil in parallel; a first closed circuit in which at least one of the first main coil and the first shield coil, and a first quench protection circuit are connected in series; and a second closed circuit in which one of the second main coil and the second shield coil, and a second quench protection circuit are connected in series.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.