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Exploring Tractography: An Analysis of Brain Connectivity Patterns in Men.
Bhamini Sharma1, Amit Mittal2, Rahul Sharma3
1Anatomy, Maharishi Markandeshwar Institute of Medical Science & Research, Ambala, IND.
Cureus
|December 20, 2024
Summary
Aging men show changes in brain white matter, particularly the inferior fronto-occipital fasciculus (IFOF). Diffusion tensor imaging (DTI) reveals age-related declines in IFOF volume and increased mean diffusivity (MD), suggesting altered neural integrity.
Area of Science:
- Neuroimaging
- Neuroscience
- Brain Anatomy
Background:
- White matter tracts form the brain's structural connectome, crucial for function.
- Assessing behavioral changes and brain health necessitates understanding these tracts.
- Diffusion tensor imaging (DTI) enables detailed visualization and characterization of white matter pathways through tractography.
Purpose of the Study:
- To investigate the impact of aging on white matter integrity in men.
- To analyze age-related changes in volume, fractional anisotropy (FA), and mean diffusivity (MD) of 10 major white matter tracts.
- To identify specific tracts sensitive to age-related alterations.
Main Methods:
- A cohort of 49 men aged 18-50 years underwent 1.5T MRI with DTI scans.
- Exclusion criteria included participants with neuronal disorders.
- Ten major white matter tracts were assessed: IFOF, SFOF, ILF, SLF, cingulum, CST, forceps major, forceps minor, uncinate fasciculus, and ATR.
- Kruskal-Wallis tests were used for statistical analysis across age groups.
Main Results:
- Significant age-related differences were observed in the inferior fronto-occipital fasciculus (IFOF), with notable changes in volume and mean diffusivity (MD).
- IFOF volume peaked in the 31-40 age group and declined in the 41-50 group (p=0.019).
- MD significantly increased with age (p<0.001), suggesting potential myelin degradation or reduced neural efficiency, while fractional anisotropy (FA) remained stable (p=0.063).
- Other tracts like SFOF and SLF showed stability, indicating resilience in certain pathways.
Conclusions:
- Tractography is valuable for understanding age-related white matter changes relevant to neurological conditions like Alzheimer's disease and dementia.
- The inferior fronto-occipital fasciculus (IFOF) is particularly sensitive to aging.
- These findings provide insights into brain connectivity and neurological health, informing interventions for cognitive preservation.
Keywords:
brain mri normaldiffusion tensor tractography (dtt)fractional anisotropy (fa)mean diffusivity (md)white matter changes on mri
