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Normal white matter development from infancy to adulthood: comparing diffusion tensor and high b value diffusion
Dafna Ben Bashat1, Liat Ben Sira, Moshe Graif
1The Wohl Institute for Advanced Imaging, Department of Radiology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel. dafnab@tasmc.health.gov.il
Journal of Magnetic Resonance Imaging : JMRI
|April 19, 2005
Summary
High b-value diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI) reveal white matter maturation from infancy to adulthood. High b-value DWI may offer unique insights into intra-axonal water, reflecting development and pathology.
Area of Science:
- Neuroimaging
- Developmental Neuroscience
- Biophysics
Background:
- White matter maturation is a complex process crucial for cognitive development.
- Diffusion MRI techniques, including conventional DTI and high b-value DWI, are vital for assessing white matter microstructure.
- Understanding normative data for white matter development is essential for interpreting pathological changes.
Purpose of the Study:
- To assess the sensitivity of high b-value DWI in detecting normal white matter maturation.
- To compare high b-value DWI with conventional DTI for evaluating white matter development.
- To establish normative quantitative data for white matter maturation using high b-value DWI.
Main Methods:
- High b-value DWI (b(max)=6000 s/mm²) and conventional DTI (b=1000 s/mm²) were acquired in 36 healthy individuals (4 months to 23 years).
- Quantitative metrics including fractional anisotropy (FA), apparent displacement, and apparent probability were measured.
- Regression analysis was used to correlate imaging metrics with age and with each other.
Main Results:
- FA, displacement, and probability values showed strong correlations with each other (r > 0.87) and with age (r > 0.82).
- Age-related white matter changes were best described by mono-exponential functions.
- Regional differences in maturation timing were observed, with splenium maturing later than genu, and centrum semi-ovale showing the latest changes.
Conclusions:
- Both high b-value DWI and DTI demonstrate white matter changes throughout development.
- High b-value DWI may primarily reflect intra-axonal water, potentially offering distinct developmental and pathological insights compared to DTI.
- These findings provide normative quantitative data for white matter maturation and highlight the complementary roles of different diffusion MRI techniques.