Four-Dimensional Computed TomographySubtraction TechniqueRadiographic Image Interpretation, Computer-AssistedRadiotherapy Planning, Computer-AssistedRadiotherapy, Computer-AssistedCone-Beam Computed TomographyImage Processing, Computer-AssistedRadiographic Image EnhancementAlgorithmsImaging, Three-DimensionalTomography, X-Ray ComputedPhantoms, ImagingRadiometryPattern Recognition, AutomatedReproducibility of ResultsRespirationImage Interpretation, Computer-AssistedRadiotherapy, Intensity-ModulatedSensitivity and SpecificityRadiotherapy DosageMovementLung NeoplasmsComputer SimulationImage EnhancementLungArtifactsRadiotherapy, Image-GuidedMagnetic Resonance ImagingFiducial MarkersDiagnostic ImagingSurgery, Computer-AssistedRespiratory-Gated Imaging TechniquesModels, AnatomicArtificial IntelligenceAutomationBrainNumerical Analysis, Computer-AssistedTorsoPatient PositioningMotionHolographyTomography, Emission-Computed, Single-PhotonSoftwareFinite Element AnalysisPositron-Emission TomographyModels, StatisticalMultimodal ImagingElasticity Imaging TechniquesRadiography, ThoracicOphthalmoscopyRadiotherapy, ConformalRespiratory MechanicsTumor BurdenFeasibility StudiesRadiopharmaceuticalsTime FactorsProstateTomography, Emission-ComputedFluorodeoxyglucose F18Models, BiologicalBrain MappingData Interpretation, StatisticalResearch DesignClinical ProtocolsTreatment Outcome