1. A computer-implemented method for visualization of diffusion tensor images comprising: providing a diffusion tensor image input produced by a magnetic resonance imaging device, the diffusion tensor image input corresponding to a brain; providing a volume of interest within the diffusion tensor image input; determining a plurality of directional classes of the volume of interest, wherein the directional classes are defined by a set of parameters; determining an optimal number of the directional classes using a criterion defined as a ratio of inertia indicators; determining a spherical scatterplot of the volume of interest augmented with a cone graph for visualization of at least one of the directional classes; and displaying the scatterplot.