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These limits become apparent when fields are designed to encompass wide regions, as when providing nodal coverage. Therefore, we developed a novel protocol to acquire double orbit CBCT images using a commercial system, and combine the images to extend the longitudinal coverage for image\u2010guided adaptive radiotherapy (IGART). The protocol acquires two CBCT scans with a couch shift similar to the \u201cstep\u2010and\u2010shoot\u201d cine CT acquisition, allowing a small longitudinal overlap of the two reconstructed volumes. An in\u2010house DICOM reading\/writing software was developed to combine the two image sets into one. Three different approaches were explored to handle the possible misalignment between the two image subsets: simple stacking, averaging the overlapped volumes, and a 3D\u20103D image registration with the three translational degrees of freedom. 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