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Verification of isocenter position accuracy. During CT localization (A) and CT verification (B) the patient is positioned on the CT couch with the target positioner box aligned with anterior and lateral lasers using the radio-opaque markers (arrows). The amount of isocenter shift between CT localization (planning CT) (C) and CT verification (D) in relation to anatomical skull base cranial structures was then evaluated directly on the CT scans.
