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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Altered white matter diffusion anisotropy in normal and preterm infants at term-equivalent age
Stephen E Rose1, Xanthy Hatzigeorgiou, Mark W Strudwick
1Centre for Magnetic Resonance, University of Queensland, Queensland, Australia. Stephen.Rose@cmr.uq.edu.au
Magnetic Resonance in Medicine
|September 26, 2008
Summary
Very preterm infants show reduced white matter (WM) integrity. Unexpectedly, term infants had lower FA and higher T2 in corticospinal tracts, possibly due to water content, impacting WM development studies.
Area of Science:
- Neuroscience
- Developmental Biology
- Medical Imaging
Background:
- White matter (WM) development is crucial for infant brain function.
- Diffusion Tensor MRI (DTMRI) is a key tool for assessing WM microstructure.
- Understanding developmental trajectories in preterm and term infants is vital.
Purpose of the Study:
- To investigate white matter (WM) development in very preterm, preterm, and term infants.
- To analyze differences in fractional anisotropy (FA) and T2 relaxation measures.
- To explore the impact of water content on WM integrity metrics.
Main Methods:
- Voxelwise analyses of DTMRI data from 12 very preterm, 11 preterm, and 10 term infants.
- Acquisition of DTMRI data with gestational ages (GA) from 25 to 32 weeks.
- Generation of T2 relaxation measures to assess brain water content.
Main Results:
- Very preterm infants exhibited reduced FA in frontal lobes and commissural pathways compared to term infants.
- Preterm infants showed reduced FA primarily in posterior corpus callosum regions.
- Term infants unexpectedly displayed reduced FA and increased T2 in corticospinal projections compared to preterm groups.
Conclusions:
- Findings suggest that increased water concentration can affect FA values in infant brains.
- Care is needed when interpreting FA indices in newborns without considering water content.
- This study highlights the complexity of early white matter development and DTMRI interpretation.
