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Diffusion tensor imaging with tract-based spatial statistics reveals local white matter abnormalities in preterm

Mustafa Anjari1, Latha Srinivasan, Joanna M Allsop

  • 1Imaging Sciences Department, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, Du Cane Road, London, W12 0HS, UK.

Neuroimage
|March 9, 2007
PubMed

Insights

Preterm infants show reduced white matter integrity, particularly in the frontal lobe and corpus callosum. Tract-based spatial statistics (TBSS) effectively identifies these microstructural abnormalities in the developing preterm brain.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Medical Imaging

Background:

  • Preterm birth is linked to neurodevelopmental impairments.
  • Cerebral white matter abnormalities are common in preterm infants.
  • Diffusion Tensor Imaging (DTI) assesses brain microstructure.

Purpose of the Study:

  • To investigate white matter microstructural differences in preterm infants compared to term-born controls using DTI.
  • To test the hypothesis of reduced fractional anisotropy (FA) in specific white matter regions of preterm infants.
  • To evaluate the utility of Tract-Based Spatial Statistics (TBSS) in identifying these abnormalities.

Main Methods:

  • Diffusion Tensor Imaging (DTI) was performed on 26 preterm infants and 6 healthy term-born controls.
  • Tract-Based Spatial Statistics (TBSS) was applied for observer-independent analysis of FA images.
  • Conventional MRI was used to exclude focal lesions in preterm infants.

Main Results:

  • Preterm infants exhibited significantly lower FA in the centrum semiovale, frontal white matter, and genu of the corpus callosum.
  • Infants born at or before 28 weeks gestational age showed additional FA reductions in the external capsule and corpus callosum.
  • TBSS successfully identified widespread white matter abnormalities in preterm infants.

Conclusions:

  • TBSS is a reliable observer-independent method for detecting white matter abnormalities in the preterm brain.
  • Reduced FA in specific white matter tracts is evident in preterm infants even without focal lesions.
  • These findings highlight the impact of preterm birth on white matter development and support early identification.

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