Feasibility study of an Ultra Low-field functional MagneticResonance Imaging system (ULF-fMRI)

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Recently, many studies of ultra low-field magnetic resonance imaging by using superconducting sensors have been reported. This brand-new technology has a potential to obtain functional information of a human brain (ULF-fMRI). A problem is that the frequency of the nuclear magnetic resonance (NMR) signal becomes extremely low and this causes difficulties to reconstruct images. We proposed a method to transform such extremely low frequency to more practical frequency by using the asymmetry spin echo method. By performing NMR experiments, we confirmed that the proposed method works properly.