{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T20:01:10Z","timestamp":1768507270018,"version":"3.49.0"},"posted":{"date-parts":[[2023,7,24]]},"group-title":"Neuroscience","reference-count":108,"publisher":"openRxiv","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2023,7,24]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  Over the last decade, there has been a tremendously increased interest in understanding the neuro-physiology of cerebrospinal fluid (CSF) flow, which plays a crucial role in clearing metabolic waste from the brain. This growing interest was largely initiated by two significant discoveries: the glymphatic system (a pathway for solute exchange between interstitial fluid deep within the brain and the CSF surrounding the brain) and meningeal lymphatic vessels (lymphatic vessels in the layer of tissue surrounding the brain that drain CSF). These two CSF systems work in unison, and their disruption has been implicated in several neurological disorders including Alzheimer\u2019s disease, stoke, and traumatic brain injury. Here, we present experimental techniques for\n                  <jats:italic>in vivo<\/jats:italic>\n                  quantification of CSF flow via direct imaging of fluorescent microspheres injected into the CSF. We discuss detailed image processing methods, including registration and masking of stagnant particles, to improve the quality of measurements. We provide guidance for quantifying CSF flow through particle tracking and offer tips for optimizing the process. Additionally, we describe techniques for measuring changes in arterial diameter, which is an hypothesized CSF pumping mechanism. Finally, we outline how these same techniques can be applied to cervical lymphatic vessels, which collect fluid downstream from meningeal lymphatic vessels. We anticipate that these fluid mechanical techniques will prove valuable for future quantitative studies aimed at understanding mechanisms of CSF transport and disruption, as well as for other complex biophysical systems.\n                <\/jats:p>","DOI":"10.1101\/2023.07.20.549937","type":"posted-content","created":{"date-parts":[[2023,7,24]],"date-time":"2023-07-24T21:05:26Z","timestamp":1690232726000},"source":"Crossref","is-referenced-by-count":1,"title":["Image Analysis Techniques for In Vivo Quantification of Cerebrospinal Fluid Flow"],"prefix":"10.64898","author":[{"given":"Daehyun","family":"Kim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yiming","family":"Gan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6502-6031","authenticated-orcid":false,"given":"Maiken","family":"Nedergaard","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9658-2954","authenticated-orcid":false,"given":"Douglas H.","family":"Kelley","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2083-0901","authenticated-orcid":false,"given":"Jeffrey","family":"Tithof","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"54368","reference":[{"key":"2023072701551067000_2023.07.20.549937v1.1","doi-asserted-by":"publisher","DOI":"10.1007\/s00415-012-6413-x"},{"key":"2023072701551067000_2023.07.20.549937v1.2","doi-asserted-by":"publisher","DOI":"10.1016\/j.expneurol.2015.07.027"},{"key":"2023072701551067000_2023.07.20.549937v1.3","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuint.2003.11.006"},{"issue":"147","key":"2023072701551067000_2023.07.20.549937v1.4","first-page":"147","article-title":"A paravascular pathway facilitates CSF flow through the brain parenchyma and the clearance of interstitial solutes, including amyloid \u03b2","volume":"4","year":"2012","journal-title":"Sci. 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