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• W3175695364 abstract "In the central nervous system of primates, several pathways are characterized by different spectra of axon diameters. In vivo methods, based on diffusion-weighted magnetic resonance imaging, can provide axon diameter index estimates non-invasively. However, such methods report voxel-wise estimates, which vary from voxel-to-voxel for the same white matter bundle due to partial volume contributions from other pathways having different microstructure properties. Here, we propose a novel microstructure-informed tractography approach, COMMIT AxSize , to resolve axon diameter index estimates at the streamline level, thus making the estimates invariant along trajectories. Compared to previously proposed voxel-wise methods, our formulation allows the estimation of a distinct axon diameter index value for each streamline, directly, furnishing a complementary measure to the existing calculation of the mean value along the bundle. We demonstrate the favourable performance of our approach comparing our estimates with existing histologically-derived measurements performed in the corpus callosum and the posterior limb of the internal capsule. Overall, our method provides a more robust estimation of the axon diameter index of pathways by jointly estimating the microstructure properties of the tissue and the macroscopic organisation of the white matter connectivity." @default.
• W3175695364 created "2021-07-05" @default.
• W3175695364 creator A5000864953 @default.
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• W3175695364 creator A5087412483 @default.
• W3175695364 date "2021-06-15" @default.
• W3175695364 modified "2023-10-16" @default.
• W3175695364 title "Bundle-Specific Axon Diameter Index as a New Contrast to Differentiate White Matter Tracts" @default.
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• W3175695364 doi "https://doi.org/10.3389/fnins.2021.646034" @default.
• W3175695364 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8239216" @default.

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