Fiducial MarkersRadiotherapy, Image-GuidedRadiotherapy, Computer-AssistedRadiotherapy Planning, Computer-AssistedGenetic MarkersRadiosurgeryPhantoms, ImagingBiological MarkersProstheses and ImplantsImaging, Three-DimensionalGoldEquipment SafetyRadiographic Image EnhancementProstateTomography, X-Ray ComputedProstatic NeoplasmsRadiotherapy, Intensity-ModulatedEquipment DesignReproducibility of ResultsTumor Markers, BiologicalImage Processing, Computer-AssistedMagnetic Resonance ImagingAlgorithms