Fiducial MarkersRadiotherapy, Image-GuidedRadiotherapy, Computer-AssistedRadiotherapy Planning, Computer-AssistedRadiosurgeryPhantoms, ImagingProstheses and ImplantsImaging, Three-DimensionalGoldEquipment SafetyRadiographic Image EnhancementTomography, X-Ray ComputedProstateProstatic NeoplasmsRadiotherapy, Intensity-ModulatedGenetic MarkersEquipment DesignBiological MarkersReproducibility of ResultsImage Processing, Computer-AssistedMagnetic Resonance ImagingAlgorithms