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An example of single fiducial tracking. (A) Computed tomography image and (B) digitally reconstructed radiograph (DRR) of an inserted fiducial marker (arrowhead). (C) Left image represents Xsight Spine Tracking at the beginning of treatment, and the right image represents the fiducial tracking with the Synchrony system during beam delivery. The upper and lower images show the projections of two orthogonal X-ray sources (cameras A and B).
