Multiple-tuned bird cage coils

Details Multiple-tuned bird cage coils Multiple-tuned bird cage coils

1999-02-24

2000-08-08

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

061006947

ABSTRACT:
A multiple tuned bird cage coil for providing a substantially uniform RF field in a cylindrical sample area of said coil and exhibiting at least two fundamental resonant frequencies comprises a plurality of leg conductors disposed spaced from an axis and at least three rings conductors disposed about the axis and coupled to the leg conductors to define the cylindrical sample area with the leg conductors. The ring conductors and the leg conductors define a low pass bird cage coil that shares a portion of each of the leg conductors with a high pass bird cage coil. A higher frequency current and a lower frequency current flow through the shared portion of each of the leg conductors to provide the substantially uniform RF field in the cylindrical sample area.

REFERENCES:
patent: 5202635 (1993-04-01), Srinivasan et al.
patent: 5212450 (1993-05-01), Murphy-Boesch et al.
Article by Buess et al., entitled "NQR Detection Using a Meanderline Surface Coil", published in Journal of Magnetic Resonance in 1991, vol. 92, pp. 348-362.
Joseph Murphy-Boesch et al., "Two Configurations of the Four-Ring Birdcage Coil for .sup.1 H-Decoupled .sup.31 P Spectroscopy of the Human Head", J. Mag. Res., Series B 103-114 (1994).
Cecil Hayes et al., "An Efficient, Highly Homogeneous Radiofrequency Coil for Whole-Body NMR Imaging at 1.5", J. Mag. Res., 63, 622-628 (1985).

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