Fig. 4.

Deep medullary veins (orange) as tracked by a 3-D tubular tracking algorithm. The vein-points detected on the expanded ventricular surface (see Fig. 2) were used as seedpoints, and tracking was performed into the deep white matter. Left: transversal minimum intensity projection showing the individual tracked vein points (small orange dots). Right: 3-D rendering of the deep medullary veins as orange tubes, the white surface is the expanded ventricular surface