Elliptical cross-section slotted-tube radio-frequency resonator

Electricity: measuring and testing – Particle precession resonance – Spectrometer components

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324322, G01R 3320

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active

046410970

ABSTRACT:
A radio-frequency coil, for nuclear magnetic resonance imaging at Larmor frequencies associated with a magnetic field of greater than about 0.5 Tesla, comprises a slotted-tube radio-frequency resonator having an elliptical cross-section. First and second complementary outer resonator portions have central bands connecting juxtaposed wing structures; the end of each of the four wings is spaced from a complementary wing portion of the other outer portion and capacitively coupled thereto. An inner structure has a pair of elliptical guard rings placed substantially in registration with the elliptical portions of the outer structure wing portions. The eccentricity ratio of the elliptical cross-section of the resonator and the resonator dimensions are arranged to provide an interior volume into which a human head or body extremity can be placed for imaging purposes.

REFERENCES:
patent: 4398149 (1983-08-01), Zens
patent: 4435680 (1984-03-01), Froncisz
patent: 4480239 (1984-10-01), Hyde
patent: 4517516 (1985-05-01), Hill
M. Mehting et al, "A Slotted Tube Resonator STR for Pulsed ESR and ODMR Experiments", J. Phys. E Sci. Instrum., vol. 13, No. 8, Aug., (1980), pp. 117, 118.
"An Efficient Decoupler Coil Design which Reduces Heating in Conductive Samples in Superconducting Spectrometers", D. W. Alderman et al., Journal of Magnetic Resonance, vol. 36, pp. 447-451, (1979).
"The Sensitivity of the Zeugmatographic Experiment Involving Human Samples", D. I. Hoult et al., Journal of Magnetic Resonance, vol. 34, pp. 425-433, (1979).
"Radio Frequency Coil Technology in NMR Scanning", D. I. Hoult, Proc. Internat. Symp. on NMR Imaging, (1982), pp. 33-39.

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