T2 relaxometry in the extremely-preterm brain at adolescence

Area of Science:

• Neuroscience
• Developmental Biology
• Medical Imaging

Background:

• Survival rates for extremely preterm infants have improved significantly.
• Long-term neurodevelopmental outcomes and associated brain changes in these individuals are not fully understood.
• Adult neuroimaging data in extremely preterm survivors is scarce.

Purpose of the Study:

• To investigate brain structure and tissue composition in young adults born extremely preterm.
• To compare extremely preterm individuals with term-born controls using advanced MRI techniques.
• To evaluate the long-term effects of extreme prematurity on brain development into adulthood.

Main Methods:

• Cohort study of 46 extremely preterm (EP) adolescents (born 22-26 weeks gestation) and 20 term-born controls at age 19.
• Magnetic resonance imaging (MRI) using T2 relaxometry (single and multi-component).
• Analysis of gray matter and white matter volumes and tissue composition.

Main Results:

• Extremely preterm adolescents exhibited significantly reduced gray and white matter volumes compared to controls.
• Tissue composition, assessed by relaxometry, did not differ significantly between EP subjects and term-born controls.
• No significant differences in tissue composition were observed based on gender.

Conclusions:

• Despite reduced brain volumes, extremely preterm individuals may have largely preserved brain tissue composition into adulthood.
• The findings suggest either subtle differences not detectable by current MRI techniques or remarkable neural plasticity.
• Further research is needed to elucidate the neural correlates of cognitive and behavioral sequelae in extremely preterm survivors.