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

近年来，利用超导传感器进行超低场磁共振成像的研究已有很多报道。这种全新的技术具有获得人脑功能信息（ULF-fMRI）的潜力。问题在于核磁共振（NMR）信号的频率变得极低，这导致难以重建图像。我们提出了一种利用非对称自旋回波方法将这种极低的频率转换为更实用的频率的方法。通过核磁共振实验，我们证实了所提出的方法工作正常。

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.