Ultrafast MRI measures brain cleaning

Researchers at the University of Oulu used ultrafast MRI to directly track water‑molecule movements in cerebrospinal fluid and observed that during sleep respiratory and slow vasomotor pulsations speed up while cardiac pulsations slow, a pattern the authors link to more efficient clearance of metabolic waste from the brain. The measurement is noninvasive and could be used to monitor age‑related decline in brain fluid dynamics and study links to memory disorders. — If validated and scaled, this technique could become a clinical biomarker for brain‑clearance function, shaping diagnostics, sleep and dementia policy, and investment in sleep‑based interventions.