The proteusone treatment rooms are equipped with a gantry rolling floor that enables the clinician to enter the patient enclosure to help patient positioning on the couch.This rolling floor is moving in conjunction with the gantry.During cone beam computed tomography acquisition, the gantry rolling floor detached from the nozzle.As a consequence, the gantry rolling floor slipped under its own weight through the rail.No one was standing on the gantry rolling floor during the gantry rotation as specified in the clinical user guide.No injury was reported.
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