%0 Journal Article %J Ieee Transactions on Applied Superconductivity %D 1999 %T High-T-c SQUIDs for low-field NMR and MRI of room temperature samples %A Schlenga, K. %A McDermott, R. F. %A Clarke, J. %A de Souza, R. E. %A Wong-Foy, A. %A Pines, A. %K frequencies %X

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.

%B Ieee Transactions on Applied Superconductivity %V 9 %P 4424-4427 %8 Jun %@ 1051-8223 %G English %U ://WOS:000081964500386 %N 2 %M WOS:000081964500386 %! High-T-c SQUIDs for low-field NMR and MRI of room temperature samples %R Doi 10.1109/77.784006