Fig. 7. Diffusion spectrum imaging slices obtained from the bovine tongue (axial orientation). Shown are adjacent axial slices of the bovine tongue (A–C, anterior to posterior) obtained by DSI and depicted as a set of 3-D ODFs. Principal fiber directions are color coded (see inset in A), with green indicating the tissue's longitudinal axis, red the vertical axis and blue the transverse axis. (D–F) Selected regions of a single voxel at increased magnification to illustrate ODF detail. (D) Single voxel image showing three distinct crossing fiber populations. (E) Single voxel image showing a single population of fibers, oriented diagonally inward towards the tip of the tongue, exhibiting longitudinal (green) and vertical (red) alignment. (F) Single voxel image showing two crossing fiber populations, orthogonal to each other. (Reproduced with permission from Gilbert et al., 2006.)