Figure A.1.

Schematic representation of the image volume with the coordinate axes, X (anterior-posterior), Y (left-right), Z (inferior-superior) and voxel-wise diagonal tensor with eigenvalues λ₁, λ₂ and λ₃ and eigenvectors $\overrightarrow{V_1}$, $\overrightarrow{V_2}$, and $\overrightarrow{V_3}$ along the image axes. Lateral cross-sections of the iso-surfaces in the X-Z plane, and 3D renderings of a representative iso-surface are shown for λ₁=λ₂=1 and λ₃=1,5,50 (left to right).