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Abstract #5017

Multiexponential analysis of diffusion exchange times reveals a distinct exchange process associated with metabolic activity

Teddy Xuke Cai1,2, Nathan Hu Williamson1, Rea Ravin1,3, and Peter Joel Basser1
1Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, United States, 2Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom, 3Celoptics, Inc., Rockville, MD, United States

Synopsis

Keywords: Diffusion/other diffusion imaging techniques, Data Analysis, ExchangeContrary to prevailing views, recent work suggests that steady-state water exchange between the intra- and extracellular space is driven, in part, by active metabolic processes. To support these findings, we investigate whether exchange exhibits multiexponential behavior consistent with distinct exchange processes. We find a bimodal distribution of exchange times in live neural tissue, with only the faster peak being reduced upon the introduction of a sodium-potassium pump inhibitor, thus supporting the existence of active exchange. Furthermore, we describe a time-efficient method of isolating exchange and fitting multiexponential exchange times using diffusion exchange spectroscopy, paving the way for future studies.

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