
This module is used for 3-D visualization of structures such as the heart, lungs, vasculature, etc. The 3-D effect is produced by projecting rays from multiple angles of view through the volumetric data set. The rendered object can be scaled and rotated about x, y, and z axes to make animated 3-D displays. Such movies can be saved as disk files for more rapid viewing via the Movie Viewer module. Special attention has been paid to render images very rapidly without the need of any special purpose hardware. The Volume Render module uses various mathematical methods in conjunction with a ray casting algorithm to produce different visual effects. Currently included are methods to map the brightest voxel along a ray, the darkest voxel, the average of all the voxels along a ray, or gradient shading. Gradient shading is a technique where a threshold range is identified by the user to select for a structure of interest (i.e. ribs) such that the casted ray stops at the first voxel in its path meeting the threshold range criteria. The distance and angular information is combined and color coded to produce the displayed image above.
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