Information AboutVoxel |
| CATEGORIES ABOUT VOXEL | |
| 3d computer graphics | |
| 3d imaging | |
| SHOPPER'S DELIGHT | |
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As with pixels, voxels themselves typically do not contain their position in space (their Coordinate s) - but rather, it is inferred based on their position relative to other voxels (i.e. their position in the data structure that makes up a single volume image). VOXEL DATA There are two interpretations for a voxel value, depending on usage:
The value of a voxel may represent various properties. In CT scans, the values are Hounsfield Units , giving the opacity of material to X-rays. Different types of value are acquired from MRI or Ultrasound . Voxels can contain multiple Scalar values; in the case of Ultrasound scans with B-mode and Doppler data, Density , and Volumetric Flow Rate are captured as separate channels of data relating to the same voxel positions. Other values may be useful for immediate 3D Rendering , such as a surface Normal Vector and Color . USES Visualization A volume containing voxels can be visualised either by direct Volume Rendering or by the extraction of Polygon iso-surfaces which follow the contours of given threshold values. The Marching Cubes algorithm is often used for iso-surface extraction, however other methods exist as well. Computer Gaming Many NovaLogic games have used voxel-based rendering technology, including the Delta Force series. TRIVIA In the minimalist webcomic '' Pixel '', in which pixels inside a computer are the main characters, one 'race' of supporting characters are the voxels, who have the "supernatural" power of moving in three dimensions. SEE ALSO EXTERNAL LINKS
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