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• W2899876890 abstract "Brain function has been investigated via the blood oxygenation level dependent (BOLD) effect using magnetic resonance imaging (MRI) for the past decades. Advances in sodium imaging offer the unique chance to access signal changes directly linked to sodium ions (23Na) flux across the cell membrane, which generates action potentials, hence signal transmission in the brain. During this process 23Na transiently accumulates in the intracellular space. Here we show that quantitative functional sodium imaging (fNaI) at 3T is potentially sensitive to 23Na concentration changes during finger tapping, which can be quantified in grey and white matter regions key to motor function. For the first time, we measured a 23Na concentration change of 0.54 mmol/l in the ipsilateral cerebellum, 0.46 mmol/l in the contralateral primary motor cortex, 0.27 mmol/l in the corpus callosum and -11 mmol/l in the ipsilateral primary motor cortex, suggesting that fNaI is sensitive to distributed functional alterations. Open issues persist on the role of the glymphatic system in maintaining 23Na homeostasis, the role of excitation and inhibition as well as volume distributions during neuronal activity. Hemodynamic and physiological signal recordings coupled to realistic models of tissue function will be critical to understand the mechanisms of such changes and contribute to meeting the overarching challenge of measuring neuronal activity in vivo." @default.
• W2899876890 created "2018-11-16" @default.
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• W2899876890 date "2018-11-09" @default.
• W2899876890 modified "2023-10-04" @default.
• W2899876890 title "Challenges and Perspectives of Quantitative Functional Sodium Imaging (fNaI)" @default.
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• W2899876890 doi "https://doi.org/10.3389/fnins.2018.00810" @default.
• W2899876890 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6237845" @default.
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• W2899876890 hasPublicationYear "2018" @default.
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