Abstract
Cyberknife image-guided radiation therapy allows precise tumor targeting using real-time tracking of radiopaque fiducial markers, and is being used increasingly in patients with unresectable pancreatic cancer. To enable appropriate fiducial tracking by the Cyberknife system, it is recommended to place fiducials with ‘ideal fiducial geometry' i.e. at least 3 fiducials with a minimum interfiducial distance >2cm, minimum interfiducial angle >15° and non-collinear placement in the imaging plane.
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