The interstitial fluid fraction assessed with spectral analysis in intravoxel-incoherent motion MRI can be a potential, non-invasive method to identify tissue damage on a microscopic level and to investigate glymphatic alterations within different disease states. The current multi-dimensional approach has a long acquisition time, thereby lowering the feasibility of IVIM as a measurement of ISF in clinical practice. This study simultaneously investigates potential group differences in the ISF-fraction in Alzheimer’s disease, mild cognitive impairment, and controls, and explores the possibility to shorten acquisition time drastically by examining the contribution of individual primary directions.
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