Chang Wei-Hao, Chen Jyh-Horng, Hwang Lian-Pin
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan.
Magn Reson Imaging. 2006 Oct;24(8):1095-102. doi: 10.1016/j.mri.2006.04.005. Epub 2006 Jun 2.
A single-sided mobile NMR apparatus with a small Halbach magnet was constructed for the first time. It is lightweight, compact and exhibits good sensitivity. The weight of the device is only 2 kg, and the NMR signal of the pencil eraser block can be detected in one shot using the device. This study describes the characteristics of this instrument, including the profile of static magnetic flux density, B0, the sensitivity in the depth direction and its effectiveness in one-dimensional profiling. Its usefulness in differentiating soft materials and evaluating the extent of damage of a material is demonstrated based on T2 relaxation data. The moisture absorbance also can be observed from the increase of the echo amplitude of the NMR spin echo signal.
首次构建了一种带有小型哈尔巴赫磁体的单面移动核磁共振装置。它重量轻、结构紧凑且灵敏度良好。该装置重量仅2千克，使用该装置一次就能检测到铅笔橡皮擦块的核磁共振信号。本研究描述了该仪器的特性，包括静磁通量密度B0的分布、深度方向的灵敏度及其在一维轮廓分析中的有效性。基于T2弛豫数据证明了其在区分软材料和评估材料损伤程度方面的实用性。从核磁共振自旋回波信号的回波幅度增加中还可以观察到吸湿情况。
