A novel quantitative simple brain metric using MR imaging for preterm infants.

Area of Science:

• Neonatal imaging
• Pediatric neurology
• Quantitative MRI

Background:

• Volumetric MRI studies indicate reduced brain volumes in preterm infants.
• Quantitative data on brain size are lacking in routine neonatal care.
• Developing simple brain metrics is crucial for assessing preterm infant brain development.

Purpose of the Study:

• To develop simple brain metrics for comparing brain size in preterm and term infants.
• To correlate these simple metrics with established volumetric MRI measurements.
• To establish reliable and easily applicable methods for quantifying brain growth in preterm infants.

Main Methods:

• MR images of 189 preterm infants and 36 term infants were analyzed.
• Fifteen tissue and fluid measures were evaluated on four selected brain sections.
• Correlations were performed between simple brain metrics and total brain, gray matter, white matter, and CSF volumes.

Main Results:

• Preterm infants showed reduced bifrontal, biparietal, and transverse cerebellar diameters and increased left ventricle diameter.
• Strong correlations were observed between bifrontal/biparietal measures and total brain tissue volume.
• Ventricle size and interhemispheric measures correlated with cerebrospinal fluid (CSF) volume, with high intraobserver reliability.

Conclusions:

• Simple brain metrics at term-equivalent age effectively differentiate brain size between preterm and term infants.
• These metrics demonstrate smaller brain diameters and enlarged ventricles in preterm infants.
• The developed metrics provide a reliable and practical approach for quantifying brain growth and assessing atrophy in high-risk preterm populations.