Corticospinal tract involvement in spinocerebellar ataxia type 3: a diffusion tensor imaging study

Area of Science:

• Neuroimaging
• Neurology
• Biomedical Engineering

Background:

• Spinocerebellar ataxia type 3 (SCA3) is a progressive neurodegenerative disorder.
• Corticospinal tract (CST) integrity is crucial for motor function.
• Diffusion tensor imaging (DTI) is a sensitive MRI technique for assessing white matter microstructure.

Purpose of the Study:

• To evaluate CST integrity in SCA3 patients using DTI.
• To investigate the correlation between CST microstructural abnormalities and ataxia severity.

Main Methods:

• Two cohorts of SCA3 patients and healthy controls were assessed using DTI at 1.5 T and 3.0 T.
• Fractional anisotropy (FA) values were analyzed across CST regions.
• Pearson's correlation was used to assess the relationship between DTI parameters and SARA scores.

Main Results:

• DTI at 1.5 T did not reveal significant differences between groups.
• DTI at 3.0 T showed significant reductions in FA values in multiple CST regions in SCA3 patients.
• Moderate correlations were observed between CST diffusivity parameters and ataxia severity in the 3.0 T cohort.

Conclusions:

• DTI, especially at 3.0 T, effectively detects and quantifies CST damage in SCA3.
• Microstructural damage in the CST is associated with the severity of ataxia in SCA3.
• These findings highlight the potential of DTI as a biomarker for disease progression and severity in SCA3.