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In the last decade C-arm-based cone-beam CT became a widely used modality forintraoperative imaging. Typically a C-arm scan is performed using a circle-liketrajectory around a region of interest. Therefor an angular range of at least180{\deg} plus fan-angle must be covered to ensure a completely sampled dataset. This fact defines some constraints on the geometry and technicalspecifications of a C-arm system, for example a larger C radius or a smaller Copening respectively. These technical modifications are usually not benificialin terms of handling and usability of the C-arm during classical 2Dapplications like fluoroscopy. The method proposed in this paper relaxes theconstraint of 180{\deg} plus fan-angle rotation to acquire a complete data set.The proposed C-arm trajectory requires a motorization of the orbital axis ofthe C and of ideally two orthogonal axis in the C plane. The trajectoryconsists of three parts: A rotation of the C around a defined iso-center andtwo translational movements parallel to the detector plane at the begin and atthe end of the rotation. Combining these three parts to one trajectory enablesfor the acquisition of a completely sampled dataset using only 180{\deg} minusfan-angle of rotation. To evaluate the method we show animal scans acquiredwith a mobile C-arm prototype. We expect that the transition of this methodinto clinical routine will lead to a much broader use of intraoperative 3Dimaging in a wide field of clinical applications.

The rotate-plus-shift C-arm trajectory: Complete CT data with less than 180{\deg} rotation