Wave transmission lines and networks – Resonators
Patent
1995-09-05
1996-09-17
Lee, Benny
Wave transmission lines and networks
Resonators
333222, 333227, 324318, 324322, H01D 700
Patent
active
055572472
ABSTRACT:
A distributed impedance circuit MR coil design comprised of a transmission line tunable cavity resonator which is well suited for but not limited to use at high frequencies and for large volumes such as in high field (e.g. 4.1 tesla) clinical MR applications. The distributed circuit transmission line resonator is designed for high frequency, large conductive volume applications where conventional lumped element coil designs fail. A resonant coaxial cavity is variably tuned to the Larmor frequency of interest by tunable transmission line elements. The resonator is effective for large head and body sized volumes, high efficiencies, and broad tuning ranges to frequencies of 500 MHz. The B.sub.1 homogeneity of the resonator is a function of the electromagnetic properties of the load itself. Maxwell's equations for the fully time-dependent B.sub.1 field predicts "coil" homogeneity with finite-element models of anatomic structure. Coil design and construction, and methods of quadrature driving and double tuning the transmission line resonator, are set forth.
REFERENCES:
patent: 4439733 (1984-03-01), Hinshaw et al.
patent: 4602234 (1986-07-01), Butson
patent: 4694255 (1987-09-01), Hayes
patent: 4712067 (1987-12-01), Roschmann et al.
patent: 4737718 (1988-04-01), Kemner et al.
patent: 4746866 (1994-05-01), Roschmann
patent: 4751464 (1988-06-01), Bridges
patent: 4799016 (1989-01-01), Rezvani
patent: 4820985 (1989-04-01), Eash
patent: 4916418 (1990-04-01), Rath
patent: 4949044 (1990-08-01), Starewicz et al.
patent: 4952878 (1990-08-01), Mens et al.
patent: 4992737 (1991-02-01), Schnur
patent: 5047720 (1991-09-01), Guy
patent: 5055853 (1991-10-01), Garnier
patent: 5277183 (1994-01-01), Vij
patent: 5349297 (1994-09-01), DeMeester et al.
patent: 5381122 (1995-01-01), Laskaris et al.
patent: 5382904 (1995-01-01), Pissanetzky
Society of Magnetic Resonance in Medicine--Works on Progress. Tenth Annual Scientific Meeting and Exhibition, Aug. 1991. San Francisco, CA.
Society of Magnetic Resonance Medicine--Proceedings of the Society of Magnetic Resonance in Medicine, vol. 1. 12th Annual Scientific Meeting, Aug., 1993, New York, NY., pp. 127, 306, 333, 368, 484, 901, 1389, 1552.
A High Frequency Tuned Resonator for Clinical NMR, J. T. Vaughan et al. Society of Magnetic Resonance in Medicine 11th Ann. Meeting 1992. p. 279.
In Vivo Magnetic Resonance Imaging and Spectroscopy of Humans with a 4T Whole-Body Magnet. H. Barfuss, et al., NMR in Biomedicine, vol. 3, No. 1, 1990., pp. 31-45.
The Theory of the Bird-Cage Resonator by James Tropp. Journal of Magnetic Resonance 82, pp. 51-62 (1989).
Bomsdorf et al, Spectroscopy and Imaging with a 4 Tesla Whole-body MR System NMR in Biomedicine, vol. 1, No. 3, 1988, pp. 151-158.
High Frequency Coils for Clinical Nuclean Magnetic Resonance Imaging and Spectroscopy, J. T. Vaughn, et al. Physica Medica Reprint. Apr.-Sep. 1993, pp. 147-153.
Schneider et al; Slotted tube resonator: A new MNR probe head at high observing frequencies. Rev. Sci. Instrum., vol. 48, No. 1, Jan. 1977, pp. 68-72.
Pascone et al., Explicit Treatment of Mutual Inductance in Eight-Column Birdcage Resonators. Magnetic Resonance Imaging, vol. 10, pp. 401-410, 1992.
Comparison of Linear and Circular Polarization for Magnetic Resonance Imaging. G. H. Glover, et al., Journal of Magnetic Resonance 64, pp. 255-270 (1985).
JMRI Journal of Magnetic Resonance Imaging, 1993 Annual Meeting Printed Program-Supp. to JMRI Mar./Apr. 1993 Issue, vol. 3(P).
The Toroid Cavity NMR Detector, Klaus Woelk et al. Journal of Magnetic Resonance, Series A 109, 137-146 (1994).
High Frequency Volume Coils for Clinical NMR Inmaging and Spectroscopy, J. Thomas Vaughan et al. Magnetic Resonance in Medicine MRM 32:206-218 (1994).
Investigations of Surface Coil Geometries Using Rotating Frame Imaging, Geoffrey David Clarke, M. S., (Dissertation) The University of Texas Health Science Center at Dallas, Nov. 1984, pp. 160-162.
A High Frequency Body Coil for Clinical NMR, J. T. Vaughan et al. Proceedings of the Second Scientific Meeting of the Society of Magnetic Resonance, p. 1113 (1994).
A Double Resonant Surface Coil for 4.1 Tesla Whole Body NMR, J. T. Vaughan et al. Proc. Tenth Annual Scientific Meeting of the Society of Magnetic Resonance in Medicine, p. 722 (1991).
Proton Nuclear Magnetic Resonance Spectroscopic Imaging of Human Temporal Lobe Epilepsy at 4.1 T, Hoby Hetherington et al. Annals of Neurology, vol. 38, No. 3, Sep. 1995, pp. 396-403.
High Resolution Neuroimaging At 4.1 T, Jullie W. Pan et al. Magnetic Resonance Imaging, vol. 13, No. 7, 1995, 0730-725X(95)02002-B.
Imaging at High Magnetic Fields: Initial Experiences at 4 T, Kamil Ugurbil, et al. Magnetic Resonance Quarterly, vol. 9, No. 4, pp. 259-277.
Gambino Darius
Lee Benny
UAB Research Foundation
LandOfFree
Radio frequency volume coils for imaging and spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radio frequency volume coils for imaging and spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio frequency volume coils for imaging and spectroscopy will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-416084