Characterization of Cardiac- and Respiratory-driven Cerebrospinal Fluid Motions Using a Correlation Mapping Technique...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Imaging

Background:

• Cerebrospinal fluid (CSF) motion is influenced by both cardiac and respiratory cycles.
• Understanding these components is crucial for diagnosing neurological conditions.
• Current knowledge of CSF bulk flow dynamics is incomplete.

Purpose of the Study:

• To characterize cardiac- and respiratory-driven CSF motion using delay time, velocity waveform correlation, and displacement.
• To differentiate the propagation characteristics of cardiac and respiratory CSF motion within the intracranial space.

Main Methods:

• Asynchronous 2D phase-contrast MRI at 3T was used to measure CSF velocity.
• Participants underwent controlled respiratory cycles (6 seconds).
• Delay time and correlation coefficients analyzed CSF motion propagation; displacement and volume calculated for cardiac and respiratory components.

Main Results:

• Cardiac-driven CSF velocity was significantly higher than respiratory-driven velocity (P < 0.01).
• Cardiac-driven motion propagated more extensively, with higher correlation coefficients in specific intracranial regions.
• Respiratory-driven displacement and motion volume were significantly greater than cardiac-driven equivalents (P < 0.01).

Conclusions:

• Correlation mapping effectively characterized cardiac- and respiratory-driven CSF velocities and propagation.
• While cardiac motion dominates CSF velocity, respiratory motion contributes more to displacement and volume changes.
• Findings enhance understanding of intracranial CSF dynamics.