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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Structural Brain Changes in Blepharospasm: A Cortical Thickness and Diffusion Tensor Imaging Study.

Yaomin Guo1, Kangqiang Peng2, Zilin Ou1

  • 1Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China.

Frontiers in Neuroscience
|November 16, 2020
PubMed
Summary

Local diffusion homogeneity, a novel MRI metric, reveals white matter abnormalities in blepharospasm (BSP) patients. These changes correlate with disease severity, offering a new way to assess disability in BSP.

Keywords:
blepharospasmcortical thicknessdiffusion tensor imagingfractional anisotropylocal diffusion homogeneity

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Area of Science:

  • Neuroimaging
  • Neurology
  • Biomedical Engineering

Background:

  • White matter abnormalities in blepharospasm (BSP) are not fully understood.
  • Conventional MRI metrics show controversial results regarding cortical thickness changes in BSP.

Purpose of the Study:

  • To evaluate local diffusion homogeneity as a metric for detecting white matter abnormalities in BSP.
  • To correlate these changes with disease features and assess cortical thickness variations.

Main Methods:

  • Diffusion tensor and structural MRI were used on 29 BSP patients and 30 healthy controls.
  • Tract-based spatial statistics and cortical thickness analysis were performed.
  • Relationships between imaging metrics and clinical assessments were analyzed.

Main Results:

  • No significant differences in cortical thickness or fractional anisotropy were found between groups.
  • BSP patients showed higher local diffusion homogeneity in specific white matter tracts (superior longitudinal fasciculus, corpus callosum, corona radiata, thalamic radiata).
  • Higher local diffusion homogeneity correlated with increased Jankovic rating scale and BSP disability index scores.

Conclusions:

  • Local diffusion homogeneity is more sensitive than conventional metrics for detecting BSP-related white matter changes.
  • This metric may serve as a valuable tool for assessing disability in blepharospasm patients.