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The reconstructions recovered with existing tractography algorithms are not really quantitative even though diffusion MRI is a quantitative modality. COMMIT stands for Convex Optimization for Microstructure Informed Tractography and is a powerful framework for enhancing the anatomical accuracy of the reconstructions by combining tractography with microstructural features of the neuronal tissue.
How? Starting from an input set of candidate fiber-tracts estimated using standard fiber-tracking techniques, COMMIT models the diffusion MRI signal in each voxel of the image as a linear combination of the restricted and hindered contributions generated in every location of the brain by these candidate tracts. Then, COMMIT seeks for the effective contribution of each of them such that they globally fit the measured signal at best. These weights can be efficiently estimated by solving a convenient linear system.
Results clearly demonstrated the benefits of the proposed formulation, opening new perspectives for a more quantitative and biologically-plausible assessment of the structural connectivity of the brain. See the references for more information.
More information/documentation, as well as a series of tutorials, can be found in the wiki pages.
To install COMMIT, refer to the installation guide.
To get started with the COMMIT framework, have a look at this tutorial, which will guide you through the main steps of the processing.
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Convex Optimization Modeling for Microstructure Informed Tractography (COMMIT)
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