Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1997-10-15
1999-11-23
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324320, 324319, 600422, G01V 300
Patent
active
059906812
ABSTRACT:
A snap-in, whole-body radio frequency coil (38) for increasing the diameter of a bore (12) of a toroidal magnetic resonance imaging apparatus includes a plurality of longitudinally extending coil elements (42) having element ends (44). The longitudinally extending coil elements are disposed on a flat, flexible, non-conductive plastic sheet (40) which is capable of being rolled and disposed concentricly in an interior diameter of the bore to form a thin-walled, bird-cage type radio frequency coil. Adjacent element ends are connected with a first capacitance C.sub.0 to resonate the coil at a certain frequency. To permit mechanically switching the resonant frequency of the coil, protruding metal contacts (60) are electrically connected to the element ends. An adjustment end ring includes separated metal pads (66) disposed on a non-conducting ring substrate (64). Adjacent metal pads are connected with second capacitances C.sub.1. The diameter of the adjustment end ring is preselected to permit resilient contact with the metal contacts. The adjustment end ring is rotatable to bring the metal pads and thus second capacitances C.sub.1 in electrical contact with the element ends which increases the total capacitance between element ends and adjusts the RF coil to resonate at a lower frequency.
REFERENCES:
patent: 4692705 (1987-09-01), Hayes et al.
patent: 4740751 (1988-04-01), Misic et al.
patent: 4920318 (1990-04-01), Misic et al.
patent: 5212450 (1993-05-01), Murphy-Boesch et al.
patent: 5406204 (1995-04-01), Morich et al.
patent: 5457387 (1995-10-01), Patrick et al.
patent: 5510714 (1996-04-01), Takahashi et al.
Joseph, Peter et al. "A Technique for Double Resonant Operation of Birdcage Imaging Coils," IEEE Trans. Medical Imaging, vol. 8, No. 3, Sep. 1989.
Lu, D. and P.M. Joseph. "A Technique of Double Resonant Operation of F-19 and H-1 Quadrature Birdcage Coils," SMRM Book of Abstracts, p. 531.
Schnall, M.D., et al. "A New Double-Tuned Probe for Concurrent .sup.1 H and .sup.31 P NMR," Journal of Magnetic Resonance, 65, 1985, pp. 122-129.
Joseph, P.M. et al. "A Double Resonant Birdcage Coil for Imaging of Flourine and Protons," 1988 SMRM Book of Abstracts, p. 263.
Rath, Alan R. "Design and Performance of a Double Tuned Birdcage Coil," Journal of Magnetic Resonance, 86, 1990, pp. 488-495.
"A Design for Double Tuned Birdcage Coil for Use in an Integrated MRI/MRS Examination," Journal of Magnetic Resonance, 89, 1990, pp. 41-50.
U.S. application No. 08/514,396, Srinivasan et al., filed Aug. 11, 1995.
Yamai, S. et al. "A Dual-Port Double-Tuned Coil," 1990 SMRM Book of Abstracts, p. 530.
Murphy-Boesch, J. et al. "A Dual Tuned, Four-Ring Birdcage for Clinical .sup.1 H.sup.31 P Spectroscopy of the Head at 4 Tesla," 1993 SMRM Book of Abstracts, p. 1331.
Shen, G.X. and Thulborn, K.R. "High Efficiency Double-Tuned RF Coil Using a Switching Technique," 1994 SMR Bok of Abstracts, p. 1124.
Mastandrea Nicholas J.
Richard Mark A.
Oda Christine K.
Picker International Inc.
Shrivastav Bry B.
LandOfFree
Low-cost, snap-in whole-body RF coil with mechanically switchabl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low-cost, snap-in whole-body RF coil with mechanically switchabl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-cost, snap-in whole-body RF coil with mechanically switchabl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1225848