1. A magnetic resonance imaging apparatus, comprising: a magnetic resonance imaging scanner to acquire diffusion-weighted imaging data from a subject; a reconstruction engine to reconstruct the acquired diffusion-weighted imaging data into diffusion-weighted image representations of the subject; a diffusion tensor engine to construct a diffusion tensor map of an area of interest of the subject from the diffusion-weighted image representations, the diffusion tensor map comprising at least one voxel of tensor; an eigenvalue/eigenvector ordering engine to obtain and order pairs of eigenvectors and eigenvalues for at least one voxel in the constructed diffusion tensor map of the area of interest of the subject; a covariance matrix determining engine to construct a covariance matrix of a major eigenvector for at least one voxel, with pairs of eigenvectors and eigenvalues obtained and ordered, in the constructed diffusion tensor map of the area of interest of the subject; a first normalized measure determining engine to compute a first normalized uncertainty measure of at least one voxel, for the constructed covariance matrix of the major eigenvector in the constructed diffusion tensor map of the area of interest of the subject; a second normalized measure determining engine to compute a second normalized uncertainty measure of at least one voxel, for the constructed covariance matrix of the major eigenvector in the constructed diffusion tensor map of the area of interest of the subject; and a rendering engine to generate a human-viewable display of an image representation of uncertainty from at least one of the first normalized uncertainty measure or the second normalized uncertainty measure.