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Updated: Feb 17, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Cerebral White Matter Maturation Patterns in Preterm Infants: An MRI T2 Relaxation Anisotropy and Diffusion Tensor
Michael J Knight1, Adam Smith-Collins2,3, Sarah Newell3
1School of Experimental Psychology, University of Bristol, UK.
Insights
Infants born very preterm show delayed white matter maturation compared to late preterm infants. Multimodal MRI effectively distinguishes these developmental pathways, aiding in early detection of neurodevelopmental differences.
Area of Science:
- Neuroscience
- Developmental Biology
- Medical Imaging
Background:
- Preterm birth is linked to adverse neurodevelopmental outcomes.
- Standard methods inadequately characterize brain maturation in preterm infants.
- White matter (WM) development is crucial for infant neurodevelopment.
Purpose of the Study:
- To evaluate white matter (WM) maturation in preterm infants at term-equivalent age.
- To assess the impact of gestational age at birth on infant brain development.
- To utilize multimodal magnetic resonance imaging (MRI) for detailed characterization.
Main Methods:
- Diffusion Tensor Imaging (DTI) and T2 relaxometry were performed on very preterm (<32 weeks) and late preterm (33-36 weeks) infants at term-equivalent age.
- Tract-based spatial statistics and T2 relaxation anisotropy analysis were applied to MRI data.
- Principal component and linear discriminant analyses identified key distinguishing variables between groups.
Main Results:
- Significantly longer T2 relaxation times and lower fractional anisotropy (FA) were observed in widespread WM regions of very preterm infants compared to late preterm infants.
- These differences were more pronounced in WM regions with earlier and faster myelination.
- Combined T2 relaxometry and DTI demonstrated high sensitivity and specificity in identifying distinct WM developmental pathways in very preterm infants.
Conclusions:
- Multimodal MRI, specifically combined T2 relaxometry and DTI, effectively characterizes specific patterns of retarded WM maturation in very preterm infants.
- These findings highlight distinct WM developmental trajectories based on preterm birth severity at term-equivalent age.
- The study provides a sensitive method for detecting neurodevelopmental differences in preterm infants.
Background And Purpose:
Preterm birth is associated with worse neurodevelopmental outcome, but brain maturation in preterm infants is poorly characterized with standard methods. We evaluated white matter (WM) of infant brains at term-equivalent age, as a function of gestational age at birth, using multimodal magnetic resonance imaging (MRI).
Methods:
Infants born very preterm (<32 weeks gestation) and late preterm (33-36 weeks gestation) were scanned at 3 T at term-equivalent age using diffusion tensor imaging (DTI) and T2 relaxometry. MRI data were analyzed using tract-based spatial statistics, and anisotropy of T2 relaxation was also determined. Principal component analysis and linear discriminant analysis were applied to seek the variables best distinguishing very preterm and late preterm groups.
Results:
Across widespread regions of WM, T2 is longer in very preterm infants than in late preterm ones. These effects are more prevalent in regions of WM that myelinate earlier and faster. Similar effects are obtained from DTI, showing that fractional anisotropy (FA) is lower and radial diffusivity higher in the very preterm group, with a bias toward earlier myelinating regions. Discriminant analysis shows high sensitivity and specificity of combined T2 relaxometry and DTI for the detection of a distinct WM development pathway in very preterm infants. T2 relaxation is anisotropic, depending on the angle between WM fiber and magnetic field, and this effect is modulated by FA.
Conclusions:
Combined T2 relaxometry and DTI characterizes specific patterns of retarded WM maturation, at term equivalent age, in infants born very preterm relative to late preterm.
