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Science 5 February 1993:
Vol. 259. no. 5096, pp. 793 - 795
DOI: 10.1126/science.8430331
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Articles

Science, Vol 259, Issue 5096, 793-795
Copyright © 1993 by American Association for the Advancement of Science

articles

A high-temperature superconducting receiver for nuclear magnetic resonance microscopy

RD Black, TA Early, PB Roemer, OM Mueller, A Mogro-Campero, LG Turner, and GA Johnson

General Electric Corporate Research and Development Center, Schenectady, NY 12301.

A high-temperature superconducting-receiver system for use in nuclear magnetic resonance (NMR) microscopy is described. The scaling behavior of sources of sample and receiver-coil noise is analyzed, and it is demonstrated that Johnson, or thermal, noise in the receiver coil is the factor that limits resolution. The behavior of superconductors in the environment of an NMR experiment is examined, and a prototypical system for imaging biological specimens is discussed. Preliminary spin-echo images are shown, and the ultimate limits of the signal-to-noise ratio of the probe are investigated.


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