High frequency antenna device in nuclear-spin tomography apparat

Details High frequency antenna device in nuclear-spin tomography apparat High frequency antenna device in nuclear-spin tomography apparat

1985-03-19

1987-05-19

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324316, 333227, G01R 3320

Patent

active

046671609

ABSTRACT:
An antenna device for exciting a magnetic high-frequency field and/or for receiving corresponding high-frequency signals in a nuclear spin tomography apparatus contains a tubular antenna part which is designed to largely pass low frequencies, for magnetic gradient fields, consists of electrically highly conductive nonmagnetic material and has means for connecting to an external energy feeding or receiving device. In order to permit a simple design for this antenna device, only the tubular antenna part is provided as a circular waveguide for exciting or receiving the high frequency field. The circular waveguide is provided at least in the region of the cross-sectional plane extending through the center of its axial dimension with a system of coupling elements for coupling in or out the corresponding high-frequency power. In addition, further coupling systems may be provided in at least two cross-sectional planes symmetrical to the central cross-sectional plane.

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patent: 3028541 (1962-04-01), Bruma et al.
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patent: 4320342 (1982-03-01), Heinzerling
patent: 4388601 (1983-06-01), Sneed, Jr. et al.
patent: 4506224 (1985-03-01), Krause
B. D. Guenther et al., Capacitively and Inductively Foreshortened Cavities for Magnetic Resonance Spectroscopy, Rev. of Sci. Inst., vol. 42, No. 4, Apr., 71.
"Research Papers" Resolution and Signal-to-Noise Relationships in NMR Imaging in the Human Body, J. Phys. E: Sci. Instrum., vol. 13, 1980, printed in Great Britain, J. M. Libove and J. R. Singer, May 2, 1979, pp. 38-44.

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