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Diffusion tensor brain imaging findings at term-equivalent age may predict neurologic abnormalities in low birth
Y Arzoumanian1, M Mirmiran, P D Barnes
1Department of Radiology, Stanford University Medical Center, Stanford, CA, USA.
Insights
Diffusion tensor imaging (DTI) can detect subtle white matter abnormalities in preterm infants at high risk for brain injury. This advanced MRI technique shows promise for predicting later neurologic issues, even when conventional MRI appears normal.
Area of Science:
- Neonatal neurology
- Neuroimaging
- Developmental pediatrics
Background:
- Low birth weight preterm infants face significant risks of brain injury, particularly white matter damage.
- Conventional MRI may not detect subtle abnormalities indicative of future neurological deficits.
Purpose of the Study:
- To evaluate the efficacy of diffusion tensor imaging (DTI) in identifying white matter abnormalities in preterm infants.
- To determine if DTI can predict later neurologic abnormalities in infants with normal or minimally abnormal conventional MRI findings.
Main Methods:
- Prospective study of 137 low birth weight (<1800 g) preterm infants.
- Neonatal conventional MRI and DTI performed near term-equivalent age.
- Neurologic development assessed at 18-24 months of age.
Main Results:
- Among 63 infants with normal conventional MRI, 13 showed abnormal neurologic outcomes (including cerebral palsy).
- DTI revealed significantly reduced fractional anisotropy in the posterior limb of the internal capsule in neurologically abnormal infants.
- This reduction was compared to control preterm infants with normal neurologic outcomes.
Conclusions:
- Neonatal DTI may enable earlier detection of microstructural abnormalities in at-risk infants.
- Combining conventional MRI with DTI can enhance the prediction of later neurologic abnormalities.
- This approach may form the basis for future interventional studies to improve infant outcomes.
Background And Purpose:
Low birth weight preterm infants are at high risk of brain injury, particularly injury to the white matter. Diffusion tensor imaging is thought to be more sensitive than conventional MR imaging for detecting subtle white matter abnormalities. The objective of this study was to examine whether diffusion tensor imaging could detect abnormalities that may be associated with later neurologic abnormalities in infants with otherwise normal or minimally abnormal conventional MR imaging findings.
Methods:
We prospectively studied 137 low birth weight (<1800 g) preterm infants. Neonatal conventional MR imaging and diffusion tensor imaging were performed near term-equivalent age before discharge, and neurologic development of the infants was later followed up at 18 to 24 months of age.
Results:
Among the preterm infants who were fully studied, 63 underwent normal conventional MR imaging. Three of these infants developed cerebral palsy, and 10 others showed abnormal neurologic outcome. Diffusion tensor imaging results for these infants showed a significant reduction of fractional anisotropy in the posterior limb of the internal capsule in neurologically abnormal infants (including those with cerebral palsy) compared with control preterm infants with normal neurologic outcomes.
Conclusion:
These results suggest that neonatal diffusion tensor imaging may allow earlier detection of specific anatomic findings of microstructural abnormalities in infants at risk for neurologic abnormalities and disability. The combination of conventional MR imaging and diffusion tensor imaging may increase the predictive value of neonatal MR imaging for later neurologic outcome abnormalities and may become the basis for future interventional clinical studies to improve outcomes.
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