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Updated: Apr 28, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Symmetry of the fornix using diffusion tensor imaging
Uta N Sboto-Frankenstein1, Tiffany Lazar, R Bruce Bolster
1Alberta Innovates Technology Futures, MR Technology, Winnipeg, MB, Canada; Biopsychology Program Department of Psychology, University of Winnipeg, Winnipeg, MB, Canada; National Research Council Institute for Biodiagnostics, MR Technology, Winnipeg, MB, Canada.
Fornix tractography in healthy individuals shows overall consistency, but with some variability in specific regions. Diffusion parameter symmetry was observed, yet tract-based spatial statistics revealed significant fractional anisotropy asymmetries in certain fornix parts.
Area of Science:
- Neuroimaging
- Diffusion Tensor Imaging (DTI)
- Tractography
Background:
- The fornix is a crucial white matter tract in the brain.
- Understanding its structural integrity and variability is essential for clinical applications.
- Previous studies have explored fornix anatomy, but comprehensive tractography and diffusion parameter analysis are needed.
Purpose of the Study:
- To fully visualize and assess the variability of the fornix tract in healthy individuals using tractography.
- To evaluate the symmetry of diffusion parameters for the entire fornix tract, both individually and in groups.
- To compare these whole-tract diffusion parameter assessments with results from tract-based spatial statistics (TBSS).
Main Methods:
- Diffusion Tensor Imaging (DTI) data acquired using a 3T MRI scanner.
- Individual fornix tractography performed to delineate the entire tract.
- Whole tract diffusion parameter symmetries assessed and compared with voxelwise TBSS analysis.
Main Results:
- The fornix tract, including columns, body, crura, and fimbria, was successfully visualized.
- Tractography showed consistency in the crus and body, but some inconsistencies in the columns and fimbria.
- Groupwise diffusion parameter asymmetries were non-significant, though fractional anisotropy (FA) approached significance (P=0.052).
- TBSS analysis identified significant FA asymmetries in the crura and fimbriae (P ≤ 0.01, corrected).
Conclusions:
- Fornix tractography demonstrates overall consistency with regional variability in the columns and fimbria.
- Parametric diffusion assessments suggest symmetry, but TBSS reveals significant FA asymmetries in specific fornix regions.
- These findings highlight the utility of combining tractography with advanced statistical analysis for detailed fornix evaluation.
