Tomography Scanners, X-Ray ComputedTomography, X-Ray ComputedPositron-Emission TomographyTomographyTomography, Optical CoherenceTomography, Emission-ComputedTomography, Spiral ComputedTomography, OpticalMultidetector Computed TomographyCone-Beam Computed TomographyGamma RaysTomography, Emission-Computed, Single-PhotonPhantoms, ImagingElectron Microscope TomographyImaging, Three-DimensionalMagnetic Resonance ImagingFluorodeoxyglucose F18Image Processing, Computer-AssistedTomography, X-RayReproducibility of ResultsSensitivity and SpecificityRadiographyRadiation DosageElasmobranchiiSkates (Fish)Radiographic Image Interpretation, Computer-AssistedEquipment DesignImage EnhancementRadiographic Image EnhancementEquipment Failure AnalysisArtifactsContrast MediaFluorine RadioisotopesBrainAlgorithmsMultimodal ImagingPredictive Value of TestsRadiometryX-Ray MicrotomographyObserver VariationRetrospective StudiesElectron Probe MicroanalysisDiagnostic ImagingProspective StudiesTime FactorsAnimal FinsPneumoconiosisRadiography, AbdominalGermaniumFour-Dimensional Computed TomographyCathode Ray TubeSubtraction TechniqueUltrasonographyWhole Body ImagingRadiography, ThoracicUltraviolet RaysFeasibility StudiesImage Interpretation, Computer-AssistedRadiology Department, HospitalTreatment OutcomeCosmic RadiationFast NeutronsCalcinosisLutetiumFollow-Up StudiesCoronary AngiographyOxygen RadioisotopesLungX-RaysTeleradiologyDose-Response Relationship, RadiationTransducersSeverity of Illness IndexAnatomy, Cross-SectionalCarbon RadioisotopesWrist JointCraniocerebral TraumaBronchographyCerebrovascular CirculationCoronary Artery DiseaseAngiographyRadiation EffectsMacula LuteaLung NeoplasmsDiagnostic ErrorsGamma CamerasSpectrometry, X-Ray EmissionPleuraDiagnostic Techniques, OphthalmologicalCalibrationBone and BonesMyocardial Perfusion ImagingMetacarpophalangeal JointSilicatesOptics and PhotonicsSignal-To-Noise RatioIncidental FindingsCardiac-Gated Imaging TechniquesRadiopharmaceuticalsAluminum Silicates