Conductivity tensors.

(A) Conductivity profile of the augmented Almi5 test case in grayscale with the conductivity tensors overlaid. Conductivity tensors are visualized in red using spherical tensor glyphs. Their size depicts the magnitude of the conductivity. The shape reflects the degree of anisotropy, from isotropic (ball shape) to highly anisotropic (ellipsoidal, rod-like). (B) Zoomed cutout of the conductivity profile. The anisotropic white matter compartment is visualized by small ellipsoidal conductivity tensors as opposed to the ball-like shape of the tensors in all other isotropic tissues. (C) Conductivity profile without overlaid conductivity tensors. Darker compartments exhibit higher conductivity.