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Electropermanent magnets for variable-field NMR

机译:用于可变场NMR的电动磁体

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In this work, a dynamically tunable B-0 field is used to perform variable-field NMR. The system consists of an array of electropermanent AlNiCo-5 magnets whose magnetizations are individually programmed using pulse-power control. This design allows the field strength to be varied for field-dispersion measurements. An ultra-broadband front-end is utilized that maintains efficient power transmission over a broad range of frequencies for robust operation without probe tuning. We perform T-1 - T-2 correlation measurements at various B-0 field strengths (0.5-2 MHz) and demonstrate discrimination of different dairy products. We observe variation in the frequency dependence of the proton spin-lattice relaxation for the different products as a function of the degree of protein hydration. This variable-field technique provides a low-cost alternative to fast field-cycling NMR and could open possibilities for novel contrast measurements and spatial encoding in magnetic resonance imaging. (C) 2019 Elsevier Inc. All rights reserved.
机译:在这项工作中,动态可调B-0字段用于执行变量场NMR。该系统由阵列的电气清洁Alnico-5磁铁组成,其磁化使用脉冲功率控制单独编程。该设计允许变化场强度以用于场分散测量。利用超宽带前端,在没有探测调谐的情况下,在鲁棒操作的范围内保持高效的电力传输。我们在各种B-0场强度(0.5-2MHz)处执行T-1-T-2相关测量,并展示不同乳制品的辨别。我们观察不同产品质子旋转晶格松弛的频率依赖性的变化,作为蛋白质水合度的函数。该可变场技术提供了快速现场循环NMR的低成本替代方案,并且可以打开新颖的对比度测量和磁共振成像中的空间编码的可能性。 (c)2019 Elsevier Inc.保留所有权利。

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