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Diffusion\u2010weighted imaging (DWI) and 3D T1\u2010weighted imaging were acquired using 3T magnetic resonance imaging. The diffusion tensor image analysis along the perivascular space (DTI\u2010ALPS) index was calculated using preprocessed DWI. The choroid plexus volume (CPV) was calculated using FreeSurfer 6.0. The mean ALPS index and CPV were compared between the older adults with poor sleep quality (PSQ) and HCs using a general linear model, adjusted for covariates including age, sex, years of education, total intracranial volume, systolic blood pressure, hemoglobin A1c, and white matter lesion volume. We also conducted a partial correlation analysis between the mean ALPS index and CPV, Montreal Cognitive Assessment (MoCA), and PSQI scores, adjusting for all the mentioned covariates. The PSQ group had a significantly lower mean ALPS index than HCs. The mean ALPS index in the PSQ group was negatively correlated with CPV and positively correlated with the MoCA score. Therefore, older adults with PSQ may experience dysfunction in the excretory pathway of the perivascular space around the medullary veins. This impairment may be associated with an increase in CPV and cognitive dysfunction.<\/jats:p>","DOI":"10.1002\/jnr.70005","type":"journal-article","created":{"date-parts":[[2024,11,29]],"date-time":"2024-11-29T05:54:09Z","timestamp":1732859649000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Decreased Water Diffusivity Along the Perivascular Space in Older Adults With Poor Sleep Quality"],"prefix":"10.1002","volume":"102","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1324-8614","authenticated-orcid":false,"given":"Junko","family":"Kikuta","sequence":"first","affiliation":[{"name":"Department of Radiology Juntendo University Graduate School of Medicine  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koji","family":"Kamagata","sequence":"additional","affiliation":[{"name":"Department of Radiology Juntendo University Graduate School of Medicine  Tokyo 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