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- W4207037863 endingPage "111446" @default.
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- W4207037863 abstract "Longitudinal MRI is used in clinical research studies to examine illness progression, neurodevelopment, and the effect of medical interventions. Such studies typically report changes in brain volume of less than 5%. However, there is a concern that these findings could be obscured or confounded by small changes in brain volume estimates caused by physiological factors such as, dehydration, blood pressure, caffeine levels, and circadian rhythm. In this study, MRI scans using the ADNI-III protocol were acquired from 20 participants (11 female) at two time points (mean interval = 20.3 days). Hydration, systolic and diastolic blood pressure, caffeine intake, and time of day were recorded at both visits. Images were processed using FreeSurfer. Three a priori hypothesised brain regions (hippocampus, lateral ventricles, and total brain) were selected, and an exploratory analysis was conducted on FreeSurfer's auto-segmented brain regions. There was no significant effect of the physiological factors on changes in the hypothesised brain regions. We provide estimates for the maximum percentage change in regional brain volumes that could be expected to occur from normal variation in each of the physiological measures. In this study, normal variations in physiological parameters did not have a detectable effect on longitudinal changes in brain volume." @default.
- W4207037863 created "2022-01-26" @default.
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- W4207037863 date "2022-04-01" @default.
- W4207037863 modified "2023-09-30" @default.
- W4207037863 title "Impact of physiological factors on longitudinal structural MRI measures of the brain" @default.
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- W4207037863 doi "https://doi.org/10.1016/j.pscychresns.2022.111446" @default.
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