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Updated: Oct 12, 2025
Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
D* from diffusion MRI reveals a correspondence between ventricular cerebrospinal fluid volume and flow in the
MinJung Jang1, SoHyun Han2, HyungJoon Cho1
1Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea.
Abstract:
Quantitative measurement of cerebrospinal fluid (CSF) flow and volume and longitudinal monitoring of CSF dynamics provide insights into the compensatory characteristics of post-stroke CSF. In this study, we compared the MRI pseudo-diffusion index (D*) of live and sacrificed rat brains to confirm the effect of ventricular CSF flow on diffusion signals. We observed the relationship between the CSF peak velocities and D* through Monte Carlo (MC) simulations to further understand the source of D* contrast. We also determined the dominant CSF flow using D* in three directions. Finally, we investigated the dynamic evolutions of ventricular CSF flow and volume in a stroke rat model (n = 8) from preoperative to up to 45 days after surgery and determined the correlation between ventricular CSF volume and flow. MC simulations showed a strong positive correlation between the CSF peak velocity and D* (r = 0.99). The dominant CSF flow variations in the 3D ventricle could be measured using the maximum D* map. A longitudinal positive correlation between ventricular CSF volume and D* was observed in the lateral (r = 0.74) and ventral-third (r = 0.81) ventricles, respectively. The directional D* measurements provide quantitative CSF volume and flow information, which would provide useful insights into ischemic stroke with diffusion MRI.
Insights
This study shows that the MRI pseudo-diffusion index (D*) can quantitatively measure cerebrospinal fluid (CSF) flow and volume. This technique offers valuable insights into CSF dynamics following ischemic stroke.
Area of Science:
- Neuroimaging
- Biophysics
- Medical Physics
Background:
- Cerebrospinal fluid (CSF) dynamics are crucial for understanding brain health, especially after stroke.
- Quantitative monitoring of CSF flow and volume can reveal compensatory mechanisms in the brain.
Purpose of the Study:
- To validate the MRI pseudo-diffusion index (D*) for measuring cerebrospinal fluid (CSF) flow and volume.
- To investigate the relationship between CSF flow dynamics and D* using simulations and a stroke rat model.
Main Methods:
- Compared MRI pseudo-diffusion index (D*) in live and sacrificed rat brains.
- Utilized Monte Carlo (MC) simulations to correlate CSF peak velocities with D*.
- Analyzed directional D* maps to determine dominant CSF flow.
- Longitudinally monitored ventricular CSF flow and volume in a stroke rat model (n=8).
Main Results:
- MC simulations demonstrated a strong positive correlation (r=0.99) between CSF peak velocity and D*.
- Maximum D* maps effectively measured dominant CSF flow variations in 3D ventricles.
- Longitudinal analysis revealed positive correlations between ventricular CSF volume and D* in lateral (r=0.74) and ventral-third (r=0.81) ventricles.
Conclusions:
- Directional D* measurements provide quantitative data on CSF volume and flow.
- This MRI-based approach offers valuable insights into CSF dynamics in ischemic stroke models.
