3-D reconstruction of a child's head using CT (computed tomography) data, showing the skin surface (orange) and skull (blue). 3-D renderings of CT scans are useful to surgeons in planning reconstructive or cosmetic surgery. A conventional CT (X-ray) scan reveals details of internal tissues in a two-dimensional, monochromatic image. These 3-D images are constructed by computer programs which use numerous sets of 2-D CT data as input. Using computer graphics, a display of the skin surface can be made 'transparent' in selected places, so that underlying tissues such as bone are made visible.

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