Radio frequency volume resonator for nuclear magnetic resonance

Details Radio frequency volume resonator for nuclear magnetic resonance Radio frequency volume resonator for nuclear magnetic resonance

1990-10-25

1993-05-18

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

052124509

ABSTRACT:
An RF resonator mounted on a dielectric support is operated in quadrature at a selected NMR frequency. The resonator consists of four axially distributed high frequency ring current paths on the support and at least four high frequency current paths interconnect each pair of adjacent ring paths. In the preferred embodiment at least sixteen equally spaced parallel segments connect each ring pair and are aligned with one another. The ring segments between the parallel segments together with the parallel segments form loops. At least one discrete capacitor is placed in each outer current loop thereby interrupting the loop. However, this is done so that no inner loop is interrupted by a capacitor. By using quadrature input/output coupling, either inductive or capacitive, a co-rotating mode is excited in the two outer loops through the inner loops providing a highly uniform field across the resonator.

REFERENCES:
patent: 4439733 (1984-03-01), Hinshaw et al.
patent: 4646024 (1987-02-01), Schenck et al.
patent: 4680548 (1987-07-01), Edelstein et al.
patent: 4692705 (1987-09-01), Hayes
patent: 4694255 (1987-09-01), Hayes
patent: 4737718 (1988-04-01), Kemner et al.
patent: 4740752 (1988-04-01), Arakawa et al.
patent: 4783641 (1988-11-01), Hayes et al.
patent: 4825163 (1989-04-01), Yabusaki et al.
patent: 4879515 (1989-11-01), Roemer et al.
patent: 4885539 (1989-12-01), Roemer et al.
patent: 4887039 (1989-12-01), Roemer et al.
patent: 4929881 (1990-05-01), Yabosaki et al.
patent: 4956608 (1990-09-01), Dorri et al.
patent: 4992737 (1991-02-01), Schnur
patent: 5041790 (1991-08-01), Tropp et al.
patent: 5053711 (1991-10-01), Hayes et al.
C. N. Chen, D. I. Hoult and V. J. Sank, J. Magn. Reson 54, 324-327 (1983). "Quadrature Detection Coils--A Further Square Root of Two Improvements in Sensitivity".
C. E. Hayes, W. A. Edelstein, J. F. Schenk, O. M. Mueller and M. Eash, J. Magn. Reson. 63, 622-628 (1985). "An Efficient, Highly Homogeneous Radiofrequency Coil for Whole-Body NMR Imaging at 1.5 T".
Alan R. Rath, J. Magn. Reson. 86, 488-495 (1990). "Design and Performance of a Double-Tuned Bird-Cage Coil" Also, ENC, Apr. 1989.
D. I. Hoult and R. E. Richards, J. Magn. Reson. 24, 71-85 (1976). "The Signal-to-Noise Ratio of the Nuclear Magnetic Resonance Experiment".
James Tropp, J. Magn. Reson. 82, 51-62 (1989). "Theory of the Bird-Cage Resonator".
Bottomley et al., Magn. Reson. Med. 7, 319-336 (1988). "Human in Vivo Phosphate Metabolite Imaging with .sup.31 P NMR".
M. D. Schnall, V. H. Subramanian and J. S. Leigh, Jr., J. Magn. Reson. 67, 129-134 (1986). "The Application of Overcoupled Tank Circuits to NMR Probe Design".
J. Murphy-Boesch et al., Abstract: Society of Magnetic Resonance in Medicine, Eighth Annual Meeting, vol. 2, p. 944, Society of Magnetic Resonance, Berkeley, Calif. 1989.
P. Joseph and D. Lu, IEEE Trans. Med. Imaging 8, 286-294 (1989). "A Technique for Double Resonant Operation of Birdcage Imaging Coils".
K. Derby, J. Tropp and C. Hawryszko, J. Magn. Reson. 86, 645-651 (1990). "Design and Evaluation of a Novel Dual-Tuned Resonator for Spectroscopic Imaging".
G. Isaac et al., J. Magn. Reson 89, 41-50 (1990) "A Design for a Double-Tuned Birdcage Coil for Use in an Integrated MRI/MRS Examination".
Donald W. Alderman and David M. Grant, J. Magn. Reson. 36, 447-451 (1979). "An Efficient Decoupler Coil Design which Reduces Heating in Conductive Samples in Superconducting Spectrometers".
V. J. Sank, C. N. Chen and D. I. Hoult, J. Magn. Reson. 69, 236-242 (1986). "A Quadrature Coil for the Adult Human Head".

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