Electropermanent magnets for variable-field NMR
| Autor: | David Ariando, Irving N. Weinberg, Sahar Jafari, Olivia Hale, Cheng Chen, Chad Ropp, Lamar O. Mair, Mason Greer, Jarred Glickstein, Anjana Hevaganinge, Soumyajit Mandal |
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| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Work (thermodynamics) Materials science Field (physics) Proton Relaxation (NMR) Biophysics Field strength Function (mathematics) 010402 general chemistry Condensed Matter Physics 01 natural sciences Biochemistry Molecular physics 030218 nuclear medicine & medical imaging 0104 chemical sciences 03 medical and health sciences 0302 clinical medicine Magnet Dispersion (optics) |
| Zdroj: | Journal of Magnetic Resonance. 303:82-90 |
| ISSN: | 1090-7807 |
| DOI: | 10.1016/j.jmr.2019.04.010 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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