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Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
High b-value q-space diffusion MRI in myelin-deficient rat spinal cords
Inbal E Biton1, Ian D Duncan, Yoram Cohen
1School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel.
Magnetic Resonance Imaging
|February 4, 2006
Summary
Myelin deficiency in rat spinal cords significantly increases water diffusion in white matter. However, diffusion anisotropy differences were not statistically significant at the diffusion time used, suggesting myelin impacts diffusion characteristics more than anisotropy.
Area of Science:
- Neuroimaging
- Biophysics
- Histology
Background:
- Myelin sheath is crucial for efficient nerve impulse transmission.
- Understanding myelin's role in water diffusion is vital for diagnosing neurological disorders.
Purpose of the Study:
- To investigate the impact of myelin deficiency on diffusion characteristics and anisotropy in rat spinal cords using high b-value q-space diffusion-weighted MRI.
- To compare diffusion MRI metrics between myelin-deficient and control rats.
Main Methods:
- Utilized excised spinal cords from myelin-deficient (md) mutant and control rats.
- Acquired multi-slice T(1), T(2), proton density (PD) MR images, and high b-value q-space diffusion MRI.
- Computed q-Space displacement, probability maps, and displacement anisotropy maps.
- Performed electron microscopy for histological validation.
Main Results:
- Myelin-deficient spinal cords exhibited altered gray/white matter contrast in conventional MRI sequences.
- Mean water displacement in white matter was significantly higher in myelin-deficient rats compared to controls.
- No statistically significant difference in white matter displacement anisotropy was observed between the groups at the studied diffusion time.
Conclusions:
- Myelin significantly influences water diffusion characteristics in white matter.
- The effect of myelin on diffusion anisotropy is less pronounced at the specific diffusion time employed in this study.
- High b-value q-space diffusion MRI is sensitive to myelin-related changes in water diffusion.
