Development of Earth's field MRI system for diagnosis at home

在本研究中，我们开发了一种磁通互感器，它由高温超导(HTS)丝组成，用于测量微弱的磁信号。结果表明，该变压器的噪声水平约为30μΦ0/Hz1/2。利用该变压器构建了超低场核磁共振系统。基于该系统，我们测量了地球S磁场中水模的质子核磁共振信号和一维核磁共振信号。阐明了HTS圆柱体块材的磁屏蔽特性。

In this research, we developed a magnetic flux transformers, which was composed of high-temperature superconductor (HTS) wire, to measure weak magnetic signal. It was shown that the noise level of the transformer was about 30 μΦ0/Hz 1/2. We utilized the transformer to construct a ultra-low field (ULF) NMR/MRI system. Based on the system, we measured proton-NMR signal and 1-demensional MRI of water phantom in Earth’ s magnetic field. We also clarified property of magnetic shielding of H TS cylindrical bulks.