Permanent magnet for NMR image detection
US6191584A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3873
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A permanent magnet for nuclear magnetic resonance image detection, includes a magnetic structure having a yoke and magnetic poles, so shaped as to delimit or enclose a cavity, at least a part of a volume of the cavity forms a compartment for receiving at least a part of a body under examination, and at least a part of the volume of the cavity is permeated by a static magnetic field having specific intensity and homogeneity characteristics; the magnetic structure has at least one open side, parallel to the static magnetic field; the magnetic structure has at least two opposite main poles, lying face to face, transverse to the open side, the static magnetic field being generated therebetween; in the vicinity of the open side, the magnet has a device for correcting the static magnetic field generated between the main poles, the correction device including an element for increasing the magnetic potential near the open side, and over a predetermined depth therefrom, transverse to the open side, without reducing the span of the opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.