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Results of the phantom study of the 10 isocenters: absolute differences in calculated residual errors between ExacTrac X-ray imaging registration and TrueBeam CBCT imaging registration (difference = ExacTrac − CBCT) in (A) translational (vertical, longitudinal, and lateral) and (B) rotational (rotation, roll, and pitch) directions, respectively. CBCT indicates cone-beam computed tomography.
