Development of a superconducting bulk magnet for NMR and MRI

作者：Nakamura Takashi; Tamada Daiki; Yanagi Yousuke; Itoh Yoshitaka; Nemoto Takahiro; Utumi Hiroaki; Kose Katsumi^*

来源：Journal of Magnetic Resonance, 2015, 259: 68-75.

DOI：10.1016/j.jmr.2015.07.012

• NMR
• MRI
• Superconducting bulk magnet
• High temperature superconducting material
• Shim coil

A superconducting bulk magnet composed of six vertically stacked annular single-domain c-axis-oriented Eu-Ba-Cu-O crystals was energized to 4.74 T using a conventional superconducting magnet for high-resolution NMR spectroscopy. Shim coils, gradient coils, and radio frequency coils for high resolution NMR and MRI were installed in the 23 mm-diameter room-temperature bore of the bulk magnet. A 6.9 ppm peak-to-peak homogeneous region suitable for MRI was achieved in the central cylindrical region (6.2 mm diameter, 9.1 mm length) of the bulk magnet by using a single layer shim coil. A 21 Hz spectral resolution that can be used for high resolution NMR spectroscopy was obtained in the central cylindrical region (1.3 mm diameter, 4 mm length) of the bulk magnet by using a multichannel shim coil. A clear 3D MR image dataset of a chemically fixed mouse fetus with (50 mu m)(3) voxel resolution was obtained in 5.5 h. We therefore concluded that the cryogen-free superconducting bulk magnet developed in this study is useful for high-resolution desktop NMR, MRI and mobile NMR device.

• 出版日期2015-10