The detailed modeling behind neurite orientation dispersion and density imaging (NODDI). The observed signal at a voxel (Atotal) is explained by the contribution from the constituting compartments, as well as how each compartment is modeled. See the text for full description. d||, parallel diffusivity; d⊥, perpendicular diffusivity; din, rate of diffusion along individual neurites; ffw, free water fraction; fin, neurite density index. Microstructure Imaging Group - University College London. NODDI Matlab Toolbox. Available at: http://mig.cs.ucl.ac.uk/index.php?n=Tutorial.NODDImatlab. Accessed November 20, 2021.