Faraday shield localized coil for magnetic resonance imaging
US4839594A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1987 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Nov 13, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3628
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Magnet (12) creates a main magnetic field along a z-axis through an image region. A localized coil (D) is disposed in the image region at least to receive magnetic resonance signals from nuclei of the subject which have been induced to resonance. The localized coil includes an inner conductor (30), an outer conductor (32), and a dielectric material (52) therebetween. The outer conductor defines a gap (50) midway between its ends. One end of the inner conductor is connected with a gate of an FET transistor (66) and the outer conductor is connected with its source. The transistor source and drain are connected by a coaxial transmission cable (38) with a DC power supply (70) which provides a DC bias across the transistor source and drain. The cable also connects the transistor with a radio frequency receiver (40) to convey preamplified magnetic resonance signals thereto. The other end of the inner conductor may be connected with the outer conductor to provide an unbalanced localized coil or the ends may each be connected with an FET transistor (66a, 66 b) in a balanced coil arrangement (FIG. 9).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.