High-T-c SQUIDs for low-field NMR and MRI of room temperature samples

TitleHigh-T-c SQUIDs for low-field NMR and MRI of room temperature samples
Publication TypeJournal Article
Year of Publication1999
AuthorsSchlenga K., McDermott R.F, Clarke J, de Souza R.E, Wong-Foy A, Pines A
JournalIeee Transactions on Applied Superconductivity
Volume9
Issue2
Pagination4424-4427
Date PublishedJun
ISBN Number1051-8223
Accession NumberWOS:000081964500386
Keywordsfrequencies
Abstract

We have constructed a high-T-c SQUID spectrometer to detect NMR signals from samples at room temperature in magnetic fields up to 3 mT. The multiloop SQUID magnetometer has a system noise of about 30 fT/Hz(1/2) at the relevant frequencies of 2 to 100 kHz, The magnetometer is operated in vacuum at 77 K, and is separated from the sample, which is less than 1.5 mm away, by a sapphire window, In a magnetic field of 2 mT we can detect the proton spin echo at 86 kHz without signal averaging. This sensitivity enables us to obtain one-dimensional images. In addition, we present data on hyperpolarized Xe-129, which has an optically pumped polarization of several percent.

URL<Go to ISI>://WOS:000081964500386
DOI10.1109/77.784006
Short TitleHigh-T-c SQUIDs for low-field NMR and MRI of room temperature samples
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