Imaging Brain Metabolism in the Newborn

Area of Science:

• Neuroscience
• Medical Imaging
• Pediatrics

Background:

• Neonatal neurologic disorders require advanced diagnostic tools.
• Positron emission tomography (PET) with 2-deoxy-2(18F)fluoro-d-glucose (FDG) offers molecular brain imaging capabilities.
• Previous PET studies in infants faced challenges due to transportation and resolution limitations.

Purpose of the Study:

• To review molecular brain imaging studies using FDG-PET in newborns and infants.
• To illustrate the application of PET technology in probing the neuropathophysiology of neonatal neurologic disorders.
• To highlight advancements in PET scanner technology for infant imaging.

Main Methods:

• Modification and installation of an animal microPET scanner (Focus 220) in a neonatal intensive care unit.
• Verification of high spatial resolution (<2 mm FWHM) of the modified microPET scanner.
• Review of existing literature on FDG-PET and GABA(A) receptor PET imaging in infants.

Main Results:

• Established the neonatal pattern of glucose metabolism, with high activity in sensory-motor cortex, medial temporal region, thalamus, brain stem, and cerebellar vermis.
• Detailed the maturational changes in glucose utilization across different brain regions from birth to 12 months.
• Described distinct patterns of GABA(A) receptor binding in newborns compared to adults, suggesting early development of amygdala/hippocampus for bonding and memory.

Conclusions:

• FDG-PET is a valuable tool for investigating neuropathophysiology in neonatal neurologic disorders.
• Infant brain development shows distinct patterns of glucose metabolism and receptor binding that mature over time.
• Hybrid PET/MR scanners offer advantages for infant imaging due to high resolution and simultaneous data acquisition.