Double-sided RF shield for RF coil contained within gradient coils used in high speed NMR imaging
US5680046A · kind A · utility
25Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1994 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Aug 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/422
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic resonance system includes a cylindrical shield disposed between a quadrature RF coil and surrounding gradient coils. The shield includes a pair of copper sheets separated by an insulating dielectric sheet. A pattern formed by cuts in one copper sheet aligns with the currents induced in the shield by one of the RF quadrature fields, and a pattern formed by cuts in the other copper shield aligns with the other RF quadrature field. The copper sheets are shorted together to prevent voltage breakdowns and short cuts are made in each to prevent gradient induced eddy currents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.