1. A system comprising: a non-transitory memory storing computer-executable instructions; and a processor that executes the computer-executable instructions to at least: receive diffusion magnetic resonance imaging (dMRI) data; determine a diffusion tensor (DT) for the dMRI data; determine a diffusional kurtosis tensor (DKT) for the dMRI data; and determine a kurtosis diffusion orientation distribution function (dODF) for the dMRI data based on the DT and the DKT, wherein the kurtosis dODF extends a Gaussian approximation of the DT to include non-Gaussian corrections of the DKT.