Volume Render Main Panel

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.

File Button:

The File button is used to call up a menu with only one item, Select Volume . Choosing the Select Volume menu item, calls up the VR:Select Volume panel, which is used to select the image(s) to be displayed. For more information on selecting images.

Edit Button:

The Edit button is used to call up a menu with two items in it.
One item is Rendering Parameters panel which is used to manipulate the volume and display it on the Volume Render main canvas. For more information.

The other item is Movie Maker panel which is used to save a sequence of renderings to a file, thus creating a movie file. This movie file may be viewed VIDA's Movie Viewer. For more information.

Clear Button:

The Clear button halts display and clears the active part of the Volume Render main canvas.






Copyright 1994-99 Division of Physiologic Imaging, Dept. of Radiology, Univ. of Iowa


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