Age, sex, and puberty related development of the corpus callosum: a multi-technique diffusion MRI study

Purpose The corpus callosum is integral to the central nervous system, and continually develops with age by virtue of increasing axon diameter and ongoing myelination. Magnetic resonance imaging (MRI) techniques offer a means to disentangle these two aspects of white matter development. We investigate the profile of microstructural metrics across the corpus callosum, and assess the impact of age, sex and pubertal development on these processes. Methods This study made use of two independent paediatric populations. Multi-shell diffusion MRI data were analysed to produce a suite of diffusion tensor imaging (DTI), neurite orientation density and dispersion imaging (NODDI), and apparent fibre density (AFD) metrics. A multivariate profile analysis was performed for each diffusion metric across 10 subdivisions of the corpus callosum. Results All diffusion metrics significantly varied across the length of the corpus callosum. AFD exhibited a strong relationship with age across the corpus callosum (partial η 2 = .65), particularly in the posterior body of the corpus callosum (partial η 2 = .72). In addition, females had significantly higher AFD compared with males, most markedly in the anterior splenium (partial η 2 = .14) and posterior genu (partial η 2 = .13). Age-matched pubertal group differences were localised to the splenium. Conclusion We present evidence of a strong relationship between apparent fibre density and age, sex, and puberty during development. These results are consistent with ex vivo studies of fibre morphology, providing insights into the dynamics of axonal development in childhood and adolescence using diffusion MRI. Target journals Brain Structure & Function; HBM; NeuroImage; Developmental Cognitive Neuroscience