Fiducial MarkersRadiotherapy, Image-GuidedAnatomic LandmarksRadiotherapy, Computer-AssistedRadiotherapy Planning, Computer-AssistedRadiosurgeryPhantoms, ImagingImaging, Three-DimensionalProstheses and ImplantsRadiographic Image EnhancementGoldEquipment SafetyTomography, X-Ray ComputedProstateProstatic NeoplasmsRadiotherapy, Intensity-ModulatedGenetic MarkersEquipment DesignImage Processing, Computer-AssistedReproducibility of ResultsBiological MarkersMagnetic Resonance ImagingHoming BehaviorAlgorithms