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Cropped cone-beam CT volume of a metallic sphere (top row) and the result of performing 3D edge detection on the volumetric data (bottom row). Original image intensity values have been mapped to [0, 255] for display purposes. The filled circle edge images at both ends (left, right) of the sphere highlight the fact that the operation is indeed carried out in 3D. If performed on a slice by slice manner all edge images would result in empty circles.
