Evaluation of deep gray matter for early brain development using quantitative susceptibility mapping

Area of Science:

• Neuroimaging
• Pediatric Radiology
• Developmental Neuroscience

Background:

• Iron accumulation in the brain is crucial for normal development.
• Quantitative susceptibility mapping (QSM) is a non-invasive MRI technique to assess iron levels.
• Deep gray matter nuclei are key areas for early brain development.

Purpose of the Study:

• To quantify magnetic susceptibility, an indicator of iron, in deep gray matter during early postnatal development.
• To compare iron-related magnetic susceptibility between normally developing infants and those with developmental delay.

Main Methods:

• MR scans and QSM were performed on 138 infants (≤1000 days postmenstrual age).
• Magnetic susceptibility was measured in the caudate nucleus, globus pallidus, putamen, and ventrolateral thalamus.
• Cross-sectional and longitudinal analyses compared susceptibility values with age and developmental status.

Main Results:

• Magnetic susceptibility in deep gray matter showed moderate positive correlations with postmenstrual age and chronological age.
• The globus pallidus exhibited the steepest increase in susceptibility with age.
• Infants with normal development had higher susceptibility in deep gray matter than those with delayed development at early postnatal ages (≤285 days PMA).

Conclusions:

• Deep gray matter magnetic susceptibility, reflecting iron content, increases with age in infants up to 1000 days PMA.
• Higher susceptibility in deep gray matter at early ages may be a biomarker for normal neurodevelopment.