Nuclear magnetic resonance apparatus using low energy magnetic elements
US4707663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Aug 15, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0278
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An NMR scanner apparatus uses a permanent magnet comprised of an assembly of magnetic material formed of a substantial number of low energy permanent magnetic elements producing magnetic flux and arranged in at least one row of columns. A frame of magnetically soft material provides a return path for the magnetic flux and provides a surface from which the columns of magnetic elements extend. A flux concentrator plate is disposed adjacent to a surface of the assembly and recessed a sufficient distance from the edge of the assembly to inhibit the loss of magnetic flux. The flux concentrator plate and the frame sandwich the magnetic assembly therebetween. A pole piece consisting of a soft magnetic material is disposed adjacent to a surface of the flux concentrator plate. The pole piece defines a scanning area substantially smaller than the area of the adjacent surface of the flux concentrator plate such that the pole piece exhibits parallel lines of magnetic flux for inducing polarization in living tissue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.