摘要
In this study, we present a compact and sensitive SQUID-detected nuclear magnetic resonance spectrometer and imager (NMR/MRI) using flux coupling in microtesla fields. The pre-polarization coil, measuring coil, pulsed coil, and gradient coils were set up inside a three-layer aluminum box while the SQUID-detector was shielded with a high-Tc superconducting vessel. A compensation field was applied to improve the field homogeneity in magnetically unshielded environments. The spin precession of protons was inductively coupled to the SQUID magnetometer via a resonant flux transformer. We obtained a signal-to-noise ratio of 120 in one measurement, a spectral resolution better than 1 Hz, and a spatial resolution of 1.3 mm in the images.
原文 | 英語 |
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文章編號 | 093903 |
期刊 | Journal of Applied Physics |
卷 | 110 |
發行號 | 9 |
DOIs | |
出版狀態 | 已發佈 - 2011 十一月 1 |
ASJC Scopus subject areas
- Physics and Astronomy(all)