Noise-Immune Coil for Unshielded Magnetic Resonance Measurements

✍ Scribed by B.H. Suits; A.N. Garroway; J.B. Miller

• Book ID: 102594587
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 103 KB
• Volume: 131
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1997.1335

✦ Synopsis

A modified split-loop resonator that is electrically balanced and the optimized shielded-loop resonators recently presented by that has no magnetic dipole moment is shown to be relatively Stensgaard (2, 3) for use as NMR imaging surface coils. A immune to environmental noise. Using a magnetic resonance surdetailed theory of shielded-loop resonators has been deface coil of this design for 14 N NQR at 3.4 MHz, it is demonstrated scribed by Harpen (4). The discussion here is limited to that magnetic resonance measurements can be made in the laborathe case where the coil size is much smaller than the RF tory without additional RF shielding and with less than a 2 dB wavelength.

increase in the rms noise. Compared to more traditional designs, After a brief discussion of the theory, we present a design the modified split-loop resonator showed a net 17-dB gain in sensifor a noise-immune (surface) coil and demonstrate 14 N NQR tivity for unshielded measurements.