Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1996-08-16
1998-06-02
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
057605840
ABSTRACT:
An RF shield is provided to prevent coupling between the gradient coils and the RF coil of an MR imaging system, wherein the RF field rotates around the RF coil axis. The shield includes a number of coaxial conductive cylinders, and further includes a plurality of cylinders formed of dielectric material, each dielectric cylinder positioned between adjacent conductive cylinders. Each conductive cylinder is formed from sheets of copper, each sheet having a pattern of conductive loops formed therein, and each loop having an associated gap to prevent induction of eddy currents therein by gradient magnetic fields produced by the MR system gradient coils. The number of conductive cylinders, and the angular orientation thereof with respect to one another, are selected to provide a plurality of closed paths for RF image current induced by the RF field, wherein respective closed paths are established by capacitive coupling between a given conductive loop of a given conductive cylinder, and conductive loops in other of the conductive cylinders.
REFERENCES:
patent: 4871969 (1989-10-01), Roemer et al.
patent: 4879515 (1989-11-01), Roemer et al.
patent: 5381093 (1995-01-01), Kawamoto
patent: 5680046 (1997-10-01), Ferderick et al.
Eisenberg Michael
General Electric Company
O'Shea Sandra L.
Pilarski John H.
Skarsten James O.
LandOfFree
Shield for MR system RF coil provided with multiple capacitive c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Shield for MR system RF coil provided with multiple capacitive c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shield for MR system RF coil provided with multiple capacitive c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1464302