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Application of DTI Visualization and Analysis on a Data Set from a Brain Tumor Patient

Figure 1: (a,b) Geometric models for visualizing the diffusion anisotropy of water in the brain. Streamtubes and streamsurfaces visualize the diffusion information in linear and planar anisotropic regions respectively. The blue and yellow shapes are isosurfaces of the ventricles and the peritumoral edema. (c) A division of barycentric space into three kinds of anisotropy regions. We generate anisotropy histograms over the barycentric space, and use the division for comparison. (d) The difference of anisotropy histograms over tumor and non-tumor sides of the brain. The brighter area reflects more tumor bearing side data points. The dark region on the top right part of the triangle implies a decrease of linear diffusion anisotropy on the tumor side of the brain. The bright region on the bottom right part implies an increase of planar diffusion anisotropy on the same side. Most of the data points are around the isotropy corner, so we zoom in the picture of the histogram toward that corner.