Noise-Immune Coil for Unshielded Magnetic Resonance Measurements
B. H. Suits, A. N. Garroway, and J. B. Miller
A modified split-loop resonator that is electrically balanced
and that has no magnetic dipole moment is shown to be relatively
immune to environmental noise. Using a magnetic resonance
surface coil of this design for 14N NQR at 3.4 MHz,
it is demonstrated that magnetic resonance measurements can be made
in the laboratory without additional RF shielding and with less than
a 2 dB increase in the rms noise. Compared to more traditional
designs, the modified split-loop resonator showed a net 17-dB
gain in sensitivity for unshielded measurements.
Journal of Magnetic Resonance 131, 154-158 (1998).
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