Image analysis techniques for in vivo quantification of cerebrospinal fluid flow

Area of Science:

• Neuroscience
• Biophysics
• Fluid Mechanics

Background:

• Growing interest in cerebrospinal fluid (CSF) flow due to discoveries of the glymphatic system and meningeal lymphatic vessels.
• Disruption of CSF flow is implicated in neurological disorders like Alzheimer's disease, stroke, and traumatic brain injury.

Purpose of the Study:

• To present experimental techniques for in vivo quantification of CSF flow.
• To provide methods for improving measurement quality and optimizing particle tracking for CSF flow analysis.
• To describe techniques for measuring arterial diameter changes as a potential CSF pumping mechanism.

Main Methods:

• Direct imaging of fluorescent microspheres injected into the CSF for in vivo flow quantification.
• Advanced image processing, including registration and masking of stagnant particles.
• Particle tracking velocimetry for CSF flow measurement and arterial diameter change assessment.

Main Results:

• Detailed experimental techniques for in vivo CSF flow quantification are presented.
• Image processing methods enhance the quality of CSF flow measurements.
• Techniques are adaptable for studying cervical lymphatic vessels.

Conclusions:

• The presented fluid mechanical techniques offer valuable tools for quantitative studies of CSF transport.
• These methods can elucidate mechanisms of CSF disruption in neurological diseases.
• The techniques are applicable to other complex biophysical systems.