Adjustable radio frequency coil for nuclear magnetic resonance i

Details Adjustable radio frequency coil for nuclear magnetic resonance i Adjustable radio frequency coil for nuclear magnetic resonance i

1987-02-09

1988-01-19

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, 333219, G01R 3320

Patent

active

047206802

ABSTRACT:
A radio frequency coil for a nuclear magnetic resonance imaging apparatus comprises a plurality of arcuate, plate-like H-shaped members which are disposed about a common axis so as to form a tube. The flanges of adjacent H-shaped members are electrically connected. The web of at least one of the H-shaped members is cut in two at its midportion to form two T-shaped plates, and the legs of the T-shaped plates are connected by capacitive coupling in a manner which allows the capacitance to be varied. A conventional variable capacitor can be used to vary the capacitance. Alternatively, each H-shaped member is divided into two T-shaped plates with overlapping legs. A dielectric material is provided between the overlapping portions, and the capacitance is varied by moving the T-shaped plates with respect to one another in the longitudinal direction of the tube so as to vary the size of the overlapping portions.

REFERENCES:
patent: 4435680 (1984-03-01), Froncisz
patent: 4563648 (1986-01-01), Hill
patent: 4594566 (1986-06-01), Maudsley
patent: 4620155 (1986-10-01), Edelstein
patent: 4621237 (1986-11-01), Timms
patent: 4634980 (1987-01-01), Misic et al.
patent: 4641098 (1987-02-01), Doty

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