Elliptical cross section gradient oil
US5177441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jun 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/385
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An examination region (12) is defined by an elliptically crossed-section cylinder (20) of a non-conductive, non-magnetic material. The x, y, and z-gradient coils (24, 26, 22) are mounted on elliptically crossed-section cylindrical surfaces along the former for causing gradient magnetic fields within the examination region. Each of the x, y, and z-gradient coils includes a plurality of arrays or groups of coil loops. The arrays of coil loops are symmetric about a central plane of symmetry. To either side of the plane of symmetry, each of the first of the x, y, and z coil arrays (74, 80, 90) include at least a first group of loops in which current flows in a clockwise direction and a second array of loops (76, 82, 90) in which current flows in an opposite direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.