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Quantifying brain-wide cerebrospinal fluid flow dynamics using slow-flow-sensitized phase-contrast MRI.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Fluid Dynamics

Background:

  • Cerebrospinal fluid (CSF) flow is crucial for brain waste clearance.
  • Current methods lack non-invasive tools to measure slow CSF flow in the subarachnoid space (SAS).
  • Understanding brain-wide CSF dynamics is limited.

Purpose of the Study:

  • To develop and validate a novel, non-invasive CSF flowmetry technique.
  • To enable quantitative measurement of slow CSF flow velocity and direction throughout the brain.
  • To investigate the physiological drivers of CSF movement in the SAS.

Main Methods:

  • Phase-contrast MRI with a slow-flow-sensitized acquisition was employed.
  • The technique achieved high sensitivity for measuring flow rates as low as 100 μm/s.
  • Whole-brain coverage was achieved, from ventricles to the SAS.

Main Results:

  • Repeatable CSF flow measurements were demonstrated.
  • Cardiac pulsation was shown to induce coherent CSF flow changes within the SAS.
  • Cardiac pulsation appears to have a stronger influence on brain-wide CSF flow than respiration.

Conclusions:

  • The proposed CSF flowmetry technique is a valuable tool for studying CSF dynamics.
  • This method advances the understanding of brain-wide CSF flow and waste clearance pathways.
  • It enables a more holistic investigation of the human brain's fluidic system.