Abstract
We constructed a ultra-low field (ULF) nuclear magnetic resonance (NMR) / magnetic resonance imaging (MRI) system employing a high-temperature superconductor (High Tc) SQUID with a separated Cu-wound flux transformer. The pickup coil consisted of two single solenoid coils and each coil was differentially connected each other. The flux transformer consisted of a pickup coil at room temperature and an input coil, which was put in liquid nitrogen and was magnetically coupled with a high-Tc SQUID. The ratio of the transformer was considered and optimized. A water phantom of 10 mL was located in the one side of pickup coil. In the system, we applied polarizing field Bp perpendicular to the measurement field Bm before measurements. Bp was 0.8 T and permanent magnet was used. By using this system, free induction decay (FID) signals of 2H were measured at Bm of 30 μT to evaluate the system. The longitudinal relaxation times T1 of water were also estimated by changing the polarizing time of Bp.
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