Apparatus for tuning an NMR field coil
US4820985A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1988 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Apr 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/34046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coil assembly for radio frequency NMR imaging is designed to resonate at a desired frequency. The assembly includes a cylindrical field coil having a pair of conductive end loops disposed in a spaced-apart relation along a central axis. A plurality of conductive segments electrically interconnect the conductive end loops at periodic points around their periphery. These conductive segments include reactive elements which cause the field coil to resonate at a given frequency. A magnetic shield is disposed about the field coil. A plurality of reactive shunts are coupled between different locations about the periphery of the field coil and a common electrical node, such as the shield. Each of the reactive shunts is variable to increase or decrease the resonant frequency of the field coil, thereby tuning it to the desired frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.