Multiphasic MR imaging: a new method for direct imaging of pulsatile CSF flow.

Area of Science:

• Medical Imaging
• Biophysics
• Neuroimaging

Background:

• Assessing cerebrospinal fluid (CSF) pulsatile flow is crucial for diagnosing neurological conditions.
• Existing methods for evaluating CSF dynamics can be invasive or provide limited information.
• Magnetic resonance (MR) imaging offers noninvasive visualization capabilities.

Purpose of the Study:

• To introduce and validate a new multiphasic MR imaging technique for pure pulsatile flow visualization.
• To assess the feasibility of this technique in imaging cerebrospinal fluid (CSF) dynamics.
• To explore its potential clinical applications in neurological disorders.

Main Methods:

• Utilized a gradient-echo pulse sequence to acquire 5-16 electrocardiographically gated MR images per cardiac cycle.
• Employed image subtraction to eliminate signals from stationary protons, isolating pulsatile flow.
• Applied the technique to image CSF flow in healthy volunteers and a patient with syringohydromyelia.

Main Results:

• The technique successfully generated pure pulsatile flow MR images in a single acquisition.
• Individual images allowed direct assessment of flow direction and velocity.
• Subtraction of image pairs effectively visualized the pulsatile nature of CSF movement.

Conclusions:

• Multiphasic MR imaging is a powerful tool for noninvasive assessment of CSF pulsatile flow dynamics.
• This technique shows promise for investigating conditions such as normal pressure hydrocephalus, syrinx, and spinal block.
• Further clinical validation may establish this as a valuable diagnostic method.