Investigations of the T 1 Temperature Dependence of Protons in Water and Contrast Agents Using a High- T c DC-SQUID-Based ULF NMR System

The temperature dependence of proton's spin-lattice relaxation time T1 in water samples and Gd-based contrast agents with a measurement field of 72 μT was systematically studied by dc-SQUID-based ultralow field (ULF) nuclear magnetic resonance (NMR) spectrometer. The temperature of samples was controlled by a thermostatic bath and the standard error of T1 was around 0.01 s within five different gr...