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- W2027853015 abstract "We have built an NMR system that employs a superconducting quantum interference device (SQUID) detector and operates in measurement fields of 2–25 μT. The system uses a pre-polarizing field from 4 to 30 mT generated by simple room-temperature wire-wound coils that are turned off during measurements. The instrument has an open geometry with samples located outside the cryostat at room-temperature. This removes constraints on sample size and allows us to obtain signals from living tissue. We have obtained 1H NMR spectra from a variety of samples including water, mineral oil, and a live frog. We also acquired gradient encoded free induction decay (FID) data from a water-plastic phantom in the μT regime, from which simple projection images were reconstructed. NMR signals from samples inside metallic containers have also been acquired. This is possible because the penetration skin depth is much greater at the low operating frequencies of this system than for conventional systems. Advantages to ultra-low field NMR measurements include lower susceptibility artifacts caused by high strength polarizing and measurement fields, and negligible line width broadening due to measurement field inhomogeneity, reducing the burden of producing highly homogeneous fields." @default.
- W2027853015 created "2016-06-24" @default.
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- W2027853015 date "2004-09-01" @default.
- W2027853015 modified "2023-10-03" @default.
- W2027853015 title "SQUID detected NMR in microtesla magnetic fields" @default.
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- W2027853015 doi "https://doi.org/10.1016/j.jmr.2004.05.015" @default.
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