Strategies for direct volume rendering of diffusion tensor fields

Diffusion-weighted magnetic resonance imaging is a relatively new modality capable of elucidating the fibrous structure of certain types of tissue. su ch as the white matter within the brain. One tool for interpreting this dat a is volume rendering because it permits the visualization of three dimensi onal structure without a prior segmentation process. In order to use volume rendering, however, we must develop methods for assigning opacity and colo r to the data, and create a method to shade the data to improve the legibil ity of the rendering. Previous work introduced three such methods: barycent ric opacity maps, hue-bails (for color), and lit-tensors (for shading). The current paper expands on and generalizes these methods, describing and dem onstrating further means of generating opacity, color, and shading from the tensor information. We also propose anisotropic reaction-diffusion volume textures as an additional tool for visualizing the structure of diffusion d ata. The patterns generated by this process can be visualized on their own or they can be used to supplement the volume rendering strategies described in the rest of the paper. Finally, because interpolation between data poin ts is a fundamental issue in volume rendering, we conclude with a discussio n and evaluation of three distinct interpolation methods suitable for diffu sion tensor MRI data.