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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Diffusion tensor imaging and correlations to Parkinson rating scales.
Niklas Lenfeldt1, William Hansson, Anne Larsson
1Department of Pharmacology and Clinical Neuroscience, Umeå University, 901 85, Umeå, Sweden, niklas.lenfeldt@neuro.umu.se.
Journal of Neurology
|August 27, 2013
Summary
Parkinson's disease progression is linked to altered brain diffusion in areas like the thalamus and basal ganglia, particularly affecting overall function and mental status, but not motor symptoms.
Area of Science:
- Neuroimaging
- Neurology
- Biomedical Engineering
Background:
- The specific brain regions contributing to Parkinson's disease (PD) progression are not fully understood.
- Diffusion tensor imaging (DTI) offers a method to study white matter integrity and its relationship to disease progression.
Purpose of the Study:
- To investigate the relationship between MRI diffusion measures and clinical/phenotypic characteristics in Parkinson's disease.
- To identify brain areas associated with the progression of Parkinson's disease symptoms and functional decline.
Main Methods:
- Sixty-four Parkinson's disease patients underwent DTI scans at baseline and over a 5-year follow-up.
- Regions of interest included frontal white matter, basal ganglia, thalamus, and cerebellum.
- Diffusion measures (mean, radial, axial diffusivity, fractional anisotropy) were analyzed against clinical scales (UPDRS, HY, SE) and phenotype.
Main Results:
- Altered diffusion in the putamen, globus pallidus, and thalamus correlated with worsening clinical scores (UPDRS I, II, HY, SE) and disease stage.
- Diffusion changes in the thalamus differentiated tremor-dominant PD from postural instability/gait disturbance phenotypes.
- Motor function scores (UPDRS III) did not show significant correlations with diffusion measures.
Conclusions:
- Decline in overall functionality and mental status in Parkinson's disease is associated with altered diffusion in the lentiform nucleus and thalamus.
- Diffusion alterations in the thalamus may be specific to certain Parkinson's disease phenotypes, like tremor dominance.
- DTI can reveal structural changes related to non-motor and overall disease progression in Parkinson's disease, though motor symptoms' relationship requires further investigation.
