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Fig. 1. —Key elements for creating high-quality three-dimensional (3D) volume renderings of muscle—tendon—bone relationships. Top shows axial CT source image (width/level, 800/200 H) from distal forearm of 23-year-old man. "Voxel histogram" is shown on bottom. This represents distribution of voxels (in the entire 3D data set) at each attenuation value. Range of 256 (28) "voxel values" on abscissa shows remapping from original 4096 (2¹²) H scale, in which original histogram was truncated between -200 and +1024 H. This remapping allows finer control over opacity curve than was possible with original 12-bit gray-scale range and allows use of VoxelView's "fast" lighting model. Color scale above abscissa shows how color is mapped to voxel values. Superimposed on voxel histogram (blue) is custom opacity function we designed (yellow graph). Higher values of opacity make range of voxel values more visible, whereas voxels with zero opacity (e.g., fat and air) are rendered transparent.

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