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Comparing 3T T1-weighted sequences in identifying hyperintense punctate lesions in preterm neonates.

D Tortora1, V Panara1, P A Mattei2

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Summary

The 1-mm reformatted 3D-fast-field echo sequence best detects periventricular leukomalacia lesions in preterm neonates. More detected lesions indicate a worse neuromotor outcome at 3 months.

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Area of Science:

  • Neonatal neurology
  • Pediatric radiology
  • Neuroimaging

Background:

  • T1-weighted MRI at 3T can have reduced contrast, potentially hindering detection of periventricular leukomalacia (PVL) in preterm neonates.
  • Hyperintense punctate lesions on T1-weighted images are key indicators of PVL.

Purpose of the Study:

  • To identify the optimal 3T T1-weighted MRI sequence for detecting hyperintense punctate lesions in preterm neonates.
  • To investigate the correlation between the number of detected lesions and clinical outcomes.

Main Methods:

  • Retrospective analysis of 200 preterm neonates' brain MRIs.
  • Evaluation of four axial T1-weighted sequences: 3-mm inversion recovery, 3-mm spin-echo, and 1-mm and 3-mm reformatted 3D-fast-field echo.
  • Statistical analysis using linear mixed-model and logistic regression to assess lesion counts and neuromotor outcomes.

Main Results:

  • 31 neonates showed at least one hyperintense punctate lesion indicative of PVL.
  • The 1-mm axial reformatted 3D-fast-field echo sequence detected significantly more lesions (P < .001) compared to other sequences.
  • A higher number of lesions detected by the 1-mm sequence, particularly in the central brain regions, correlated with poorer neuromotor outcomes.

Conclusions:

  • The 1-mm axial reformatted 3D-fast-field echo sequence is superior for identifying hyperintense punctate lesions associated with PVL in preterm neonates at 3T.
  • The number of these lesions, especially in central brain areas, serves as a significant predictor of neuromotor development in this population.