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7 Jun 2010

Volume 96, Issue 23, Articles (23xxxx)

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Appl. Phys. Lett. 96, 231104 (2010); http://dx.doi.org/10.1063/1.3443734 (3 pages)

Hiroto Sekiguchi, Katsumi Kishino, and Akihiko Kikuchi
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On the feasibility of neurocurrent imaging by low-field nuclear magnetic resonance

Martin Burghoff, Hans-Helge Albrecht, Stefan Hartwig, Ingo Hilschenz, Rainer Körber, Nora Höfner, Hans-Jürgen Scheer, Jens Voigt, Lutz Trahms, and Gabriel Curio

Appl. Phys. Lett. 96, 233701 (2010); http://dx.doi.org/10.1063/1.3441410 (3 pages) | Cited 5 times

Online Publication Date: 9 June 2010

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We describe a nuclear magnetic resonance (NMR) spectrometer operating at 20 μT with a frequency resolution of 2 mHz to determine the intrinsic linewidth of the proton resonance in the human brain to be about 3 Hz. Using the same system we measured a biomagnetic field of 0.5 to 1 pT amplitude, which was generated by sustained brain activity evoked during repetitive median nerve stimulation. From these data, the effect of neuronal currents on the proton NMR signal was estimated. We conclude that neuronal currents may cause a measurable shift of the proton NMR line of brain tissue in low-fields.
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87.61.-c Magnetic resonance imaging
87.50.C- Static and low-frequency electric and magnetic fields effects
87.19.lf MRI: anatomic, functional, spectral, diffusion
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