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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Diffusion tensor imaging-based pontine damage as a degeneration marker in synucleinopathy.

Seok Jong Chung1,2, Kyoo Ho Cho1,3, Yang Hyun Lee1

  • 1Department of Neurology, Yonsei University College of Medicine, Seoul, South Korea.

Journal of Neuroscience Research
|September 14, 2021
PubMed
Summary

Diffusion tensor imaging (DTI) can detect pontine damage in synucleinopathies. Mean diffusivity (MD) in the pons shows potential as a biomarker for neurodegeneration in Parkinson's disease, idiopathic rapid eye movement sleep behavior disorder, and multiple system atrophy.

Keywords:
diffusion tensor imagingmean diffusivityponssynucleinopathy

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Area of Science:

  • Neuroimaging
  • Neurology
  • Biomarkers

Background:

  • Synucleinopathies, including Parkinson's disease (PD), idiopathic rapid eye movement sleep behavior disorder (iRBD), and multiple system atrophy (MSA), often show early pathology in the pons.
  • Diffusion tensor imaging (DTI) is a sensitive technique for evaluating white matter integrity and detecting microstructural changes in the brain.

Purpose of the Study:

  • To assess the diagnostic value of pontine damage measurement using DTI in patients with synucleinopathies.
  • To investigate the discriminatory power of DTI-derived metrics in differentiating synucleinopathy patients from healthy controls.

Main Methods:

  • Recruited 49 PD, 16 iRBD, 23 MSA patients, and 39 healthy controls.
  • Acquired high-resolution T1-weighted imaging and DTI data from all participants.
  • Calculated mean diffusivity (MD) and fractional anisotropy (FA) in the pons and performed receiver operating characteristic (ROC) analyses.

Main Results:

  • Patients with PD, iRBD, and MSA exhibited increased pontine MD and decreased FA compared to controls.
  • Pontine MD showed fair to excellent discriminatory power for differentiating synucleinopathy patients from controls (AUCs: PD=0.813, iRBD=0.779, MSA=0.951).
  • Pontine FA had lower discriminatory power than MD for PD and iRBD differentiation.

Conclusions:

  • Increased pontine mean diffusivity (MD) may serve as a valuable imaging biomarker for detecting brainstem neurodegeneration in synucleinopathies.
  • DTI metrics, particularly MD, show promise for early diagnosis and monitoring of neurodegenerative changes in the pons.