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Magnetic resonance imaging of normal and pathological white matter maturation
Insights
This study examined white matter myelination in children using MRI. Myelination completes by one year, with gray/white matter contrast increasing until age ten.
Area of Science:
- Neuroscience
- Radiology
- Pediatric Imaging
Background:
- White matter myelination is a critical developmental process in children.
- Understanding normal myelination patterns is essential for diagnosing developmental disorders.
Purpose of the Study:
- To quantitatively assess white matter myelination in children using Magnetic Resonance Imaging (MRI).
- To establish normative data for myelination parameters and identify deviations indicative of pathological maturation.
Main Methods:
- Fifty children aged 3 months to 16 years underwent MRI scans at 0.35 T and 1.0 T.
- Myelination was evaluated using qualitative assessment and quantitative measures including T1 relaxation times, proton densities, and image contrast.
- Age-matched controls were used for comparison.
Main Results:
- A significant decrease in white matter T1 relaxation times and proton density was observed with increasing age, completing by one year.
- Gray/white matter contrast increased up to the first decade in regions with slower myelination.
- Abnormal relaxation values or delayed myelin formation compared to controls indicated pathological white matter maturation.
Conclusions:
- MRI provides valuable quantitative and qualitative data for assessing pediatric white matter myelination.
- Deviations from established age-related myelination patterns can be identified, aiding in the diagnosis of white matter disorders.
Abstract:
Fifty children between 3 months postnatal and 16 years of age were examined by means of a 1.5 T superconductive magnet, run at 0.35 and 1.0 T. The myelination was studied qualitatively and quantitatively (relaxation times, proton densities, image contrast). With increasing age, a decrease of T1 and proton density of white matter was found, which was complete at one year of age. In regions with a slow progression of myelination, gray/white matter contrast showed an increase up to the end of the first decade. Pathological white matter maturation was diagnosed either as an abnormal transformation of myelin (characterized by abnormal relaxation values), or as a deficient or delayed myelin formation (in comparison with age-matched controls).