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Dose to the center of a 16 cm CTDI phantom placed at the iso-center of the proposed extremities CBCT system as a function of tube output (mAs) for a scan of 480 projections. Solid line: 80 kVp beam, dash-dotted line: 90 kVp beam, dashed line: 110 kVp beam. The two imaging protocols used throughout this study are marked on the graph: the bone protocol at 0.1 mAs/projection and the soft-tissue protocol at 0.25 mAs.
