As the source and detectors rotate around the object, rays penetrate the object from different directions, or projection angles, passing through different combinations of pixel locations. The density distribution of the object in the slice plane is mathematically generated from these measurements, and ...
one or more regions within the three-dimensional image222may be identified based upon such regions corresponding to locations where a connected part of the item is predicted to be located. That is, a gun item (e.g., the first item212) may be known to comprise a gun barrel (...