Accurate Anisotropic Fast Marching for Diffusion-Based Geodesic Tractography

Figure 1

Example geodesics in a double isotropic space. Black arrows show the local orientations of the geodesics. The speed in the dark grey region is twice as high as that in the light grey one. Notice that in each separate space, the geodesics are straight lines. Also, notice how one of the geodesics (bold dashed lines) travels backward to the high speed part before getting back to the low speed one.