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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
White matter abnormalities are related to microstructural changes in preterm neonates at term-equivalent age: a
1Departments of Radiology, ULB-Hôpital Erasme, Brussels, Belgium. yanliu@ulb.ac.be
AJNR. American Journal of Neuroradiology
|January 14, 2012
Summary
Mild white matter abnormalities (WMA) in preterm infants are linked to altered diffusion tensor imaging (DTI) parameters, particularly radial diffusivity (λ(⊥)), indicating microstructural changes in specific brain fibers.
Area of Science:
- Neuroimaging
- Pediatric Neurology
- Biomedical Engineering
Background:
- Preterm infants face high risks of brain injury and neurodevelopmental issues.
- White matter abnormalities (WMA) on conventional MRI are common in this population.
- Diffusion Tensor Imaging (DTI) offers detailed insights into white matter microstructure.
Purpose of the Study:
- To investigate the association between WMA on conventional MRI and DTI parameters.
- To analyze specific white matter fiber tracts in preterm neonates at term-equivalent age.
Main Methods:
- Seventy preterm neonates underwent MRI and DTI analysis.
- WMA were classified (none, mild, moderate, severe).
- Probabilistic tractography assessed tract volumes and diffusion indices (FA, MD, λ(//), λ(⊥)) in key fiber tracts.
Main Results:
- Significant associations found between WMA and microstructural changes.
- Mild WMA correlated with increased radial diffusivity (λ(⊥)) and mean diffusivity (MD) in specific tracts.
- Fractional anisotropy (FA) decreased in the left sensory superior thalamic radiation (STR) with mild WMA.
Conclusions:
- Altered DTI indices, especially radial diffusivity (λ(⊥)), are associated with mild WMA in preterm neonates.
- These findings highlight DTI's role in characterizing white matter changes in preterm infants.
