Visualization software is written using OpenGL and GLUT. DT-MRI
anisotropy for the volume is shown using 2D texture mapping on the
three orthogonal planes. Fibers are rendered using illuminated
streamline techniques described in Banks Banks94 and Hege
Hege96 with diffuse and specular terms. Stream tubes are
rendered as a longs sequence of cylinder primitives with axes
following the fiber.
For glyph based rendering, we choose to form rotation and scaling
matrices from eigenvectors and eigenvalues for every voxel of the
original data and then apply them to cubes positioned in the center of
The direction of eigenvectors and magnitude of corresponding
eigenvalues together with anisotropy measures are pre-computed to
allow interactive frame rate during visualization.
All renderings are performed using NVIDIA GeForce4 Ti4200 video card
on Pentium4 2.80GHz PC with 1GB of RAM.