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Abstract #3004

Associations between Extracellular Diffusivity Along Perivascular Space (eALPS) and Structural Abnormalities in Brain

Sang-Young Kim1, Eunju Kim1, Jinwoo Hwang1, Joo Hyun Kim1, and Chae Jung Park2
1Health Systems, Philips Healthcare, Seoul, Korea, Republic of, 2Department of Radiology, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea, Republic of

Synopsis

Keywords: Neurofluids, Diffusion Tensor ImagingNon-invasive measure of glymphatic function or flow in vivo has gained a great attention from neuroscience research community. Diffusion tensor imaging (DTI) can provide a mean that measures the diffusivity along perivascular space (ALPS). However, conventional DTI captures diffusion indices from both tissue and free water compartments due to partial volume effects, which may raise a concern about validity of DTI-ALPS index for glymphatic function. In this work, we present a novel method that can extract extracellular diffusivity (i.e., eALPS) using free water eliminated DTI and investigate the relationship between eALPS and structural abnormalities in brain.

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