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[Regional differences of in vivo proton MR spectroscopy in developing human brain]
K Ando1, R Ishikura, T Morikawa
1Department of Radiology, Hyogo College of Medicine.
Insights
Regional differences in proton MR spectroscopy (1H-MRS) in infants reveal distinct brain maturation patterns. Frontal white matter shows rapid early development, while parietal regions mature more gradually, highlighting developmental variations.
Area of Science:
- Neuroscience
- Biomedical Imaging
Background:
- The developing human brain undergoes significant structural and chemical changes during infancy.
- Understanding regional maturation patterns is crucial for identifying normal development and potential abnormalities.
Purpose of the Study:
- To investigate and clarify regional variations in proton magnetic resonance spectroscopy (1H-MRS) during early human brain development.
- To compare 1H-MRS spectral data between frontal and parietal white matter in infants.
Main Methods:
- Proton MR spectra were acquired from 24 infants aged 0-24 months using a 3D-chemical shift imaging (3D-CSI) sequence on a 1.5 Tesla MRI scanner.
- Spectra were analyzed from defined voxels in frontal and parietal white matter regions.
- Key metabolite ratios, including N-acetylaspartate/choline (NAA/Cho) and choline/creatine (Cho/Cr), were calculated and compared across regions and age groups.
Main Results:
- Frontal NAA/Cho ratios were lower at birth than parietal but increased rapidly in the first six months, with a slower rate in the second year.
- Paracentral NAA/Cho ratios were high at birth and increased slowly over two years.
- Frontal Cho/Cr ratios remained stable in the first year, then decreased, while parietal Cho/Cr ratios decreased throughout infancy.
Conclusions:
- Significant regional differences in 1H-MRS spectral profiles exist in the infant brain.
- These spectral differences suggest distinct regional patterns of brain maturation during the first two years of life.
- 1H-MRS is a valuable tool for assessing developmental trajectories in specific brain regions.
Abstract:
The purpose of this study was to clarify regional differences in proton MR spectroscopy (1H-MRS) in the developing human brain. Proton MR spectra were obtained from 24 infants aged 0 to 24 months old. Proton MR spectroscopy was performed on a 1.5 Tesla clinical MR unit using a 3D-chemical shift imaging sequence (3D-CSI). MR spectra obtained from voxels in frontal white matter and those in parietal white matter were compared. The NAA/Cho ratios of the frontal region were lower than those of the parietal region at birth but increased rapidly during the first six months of life. The rate of increase was reduced in the second year of life. In contrast, NAA/Cho ratios in paracentral areas were already high at birth but increased slowly through the first two years of life. Cho/Cr ratios of the frontal region were stable during the first year of life and started to decrease in the second year of life. In the parietal region, Cho/Cr ratios were decreased throughout infancy. Regional differences in 1H-MRS spectra were apparent during infancy, and these differences were suggested to reflect regional differences in the maturation of the developing human brain.