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Compositing-circling scanning mode. In such a CT system, the scanning trajectory is a composition of two circular motions: while an X-ray focal spot is rotated on a plane facing a short object to be reconstructed, the X-ray source is also rotated around the object on the gantry plane. Once a projection dataset is acquired, exact or approximate reconstruction can be done in a number of ways (Copyright by Wang G, Yu HY, US Provisional Patent Application, 2007).
