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Updated: Jun 26, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Reduced corpus callosum white matter microstructural integrity revealed by diffusion tensor eigenvalues in abstinent
In-Sung Kim1, Yang-Tae Kim, Hui-Jin Song
1Department of Medical & Biological Engineering, Kyungpook National University, Daegu, Republic of Korea.
Abstract:
The purpose of the current study was to determine whether abstinent methamphetamine (MA) abusers demonstrate differences in white matter (WM) integrity of the corpus callosum (CC) due to possible neurotoxic effects of long-term MA abuse, compared with control subjects. In addition to fractional anisotropy (FA), the eigenvalues of the diffusion ellipsoid were used to evaluate the microstructural source of abnormal change in abstinent MA abusers if there occurred a difference in white matter integrity of the CC between healthy controls and abstinent MA abusers. Results showed significantly reduced FA in the genu of the corpus callosum in MA-dependent subjects compared with controls. Furthermore, the eigenvalues offered a unique opportunity to assess the microstructural source of abnormal changes in the genu of the CC. The relationships between Wisconsin Card Sorting Test (WCST) performance and the values of tensor measures also suggest that altered myelination is a possible source of FA reduction observed in the genu of the CC in MA abusers.
Insights
Abstinent methamphetamine abusers show reduced white matter integrity in the brain's corpus callosum. This study suggests altered myelination may explain these neurotoxic effects in long-term users.
Area of Science:
- Neuroscience
- Radiology
Background:
- Long-term methamphetamine abuse may cause neurotoxic effects.
- White matter integrity is crucial for brain function.
Purpose of the Study:
- To investigate white matter integrity differences in the corpus callosum of abstinent methamphetamine abusers compared to controls.
- To explore the microstructural sources of potential abnormalities using diffusion tensor imaging.
Main Methods:
- Diffusion tensor imaging (DTI) was used to assess white matter integrity.
- Fractional anisotropy (FA) and eigenvalues of the diffusion ellipsoid were analyzed.
- Comparison between abstinent methamphetamine abusers and healthy control subjects.
Main Results:
- Significantly reduced FA was observed in the genu of the corpus callosum in methamphetamine-dependent subjects.
- Eigenvalues provided insights into the microstructural basis of these changes.
- Correlations between cognitive performance (WCST) and DTI measures suggest altered myelination.
Conclusions:
- Abstinent methamphetamine abusers exhibit compromised white matter integrity in the corpus callosum.
- Altered myelination is a potential microstructural cause for reduced FA in the genu of the corpus callosum.
- These findings highlight the lasting neurotoxic effects of methamphetamine abuse.
