Magnetic field generator for MRI
US5621324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1994 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Jan 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/383
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnet field generating apparatus for MRI, comprising: PA1 a plurality of permanent magnet assemblies disposed continuously around the angular inner circumference of a hexagonal tubular yoke to provide a uniform magnetic field at the center portion of the hollow space inside said permanent magnet assemblies; the permanent magnet assemblies forming a main magnetic field by a pair of oppositely disposed permanent magnet assemblies which are trapezoidal or square in cross-section; other pairs of permanent magnet assemblies having a triangular or square cross-section; each of the pairs of oppositely disposed permanent magnet assemblies has a side surface in contact with a part of the inner peripheral surface of the yoke and forms a plurality of permanent magnet blocks which are magnetized perpendicularly to the side surface in contact with the yoke so that the permanent magnet assemblies are magnetized perpendicularly to the side surface thereof in contact with the yoke; magnetic pole pieces disposed on each surface of the pair of oppositely disposed permanent magnet assemblies; and permanent magnet piece projections having the same magnetizing direction as the plurality of permanent…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.