Super-resolution track-density imaging (TDI) is an image reconstruction method for diffusion MRI data, which is capable of providing spatial resolution beyond the acquired data, as well as novel and useful anatomical contrast that cannot be obtained with conventional reconstruction methods. In this issue, Dai et al. used short-track TDI, a variation of TDI with enhanced contrast for grey matter structures, to reconstruct a super-resolution direction-encoded color map of fixed tree-shrew brain, a selected coronal slice of which is shown in the cover image. See pages 438-448. (Cover image provided by Dr. Jian-Kun Dai).