Radio frequency field coil and power splitter for NMR
US5132621A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Apr 24, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/5659
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radio frequency coil for use in MR imaging applications includes a series of conducting segments aligned with the longitudinal, static magnetic field of the MR magnet. A hybrid power splitter/combiner feeds each axial segment with a phased signal to generate a transverse circularly polarized magnetic field. The power splitter combiner isolates the axial segments to reduce magnetic field distortions produced by capacitive coupling between the imaged object and the radio frequency coil. The axial segments are tuned to series resonance to further reduce capacitive coupling. A stepped shield design permits separation of the power splitter combiner from the axial segments without piercing the bore tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.