Tomography Scanners, X-Ray ComputedTomography, X-Ray ComputedTomographyPositron-Emission TomographyTomography, Optical CoherenceTomography, Emission-ComputedTomography, Spiral ComputedTomography, OpticalMultidetector Computed TomographyGamma RaysCone-Beam Computed TomographyTomography, Emission-Computed, Single-PhotonPhantoms, ImagingElectron Microscope TomographyImaging, Three-DimensionalMagnetic Resonance ImagingTomography, X-RayImage Processing, Computer-AssistedFluorodeoxyglucose F18Reproducibility of ResultsSensitivity and SpecificityRadiographyRadiation DosageElasmobranchiiSkates (Fish)Equipment DesignRadiographic Image Interpretation, Computer-AssistedImage EnhancementEquipment Failure AnalysisRadiographic Image EnhancementFluorine RadioisotopesBrainArtifactsContrast MediaAlgorithmsX-Ray MicrotomographyElectron Probe MicroanalysisPredictive Value of TestsRadiometryObserver VariationDiagnostic ImagingProspective StudiesRetrospective StudiesAnimal FinsPneumoconiosisTime FactorsCathode Ray TubeMultimodal ImagingGermaniumFour-Dimensional Computed TomographyUltrasonographyUltraviolet RaysRadiography, AbdominalCosmic RadiationFast NeutronsRadiology Department, HospitalSubtraction TechniqueWhole Body ImagingRadiography, ThoracicLutetiumFeasibility StudiesImage Interpretation, Computer-AssistedCalcinosisOxygen RadioisotopesTreatment OutcomeFollow-Up StudiesCoronary AngiographyX-RaysLungDose-Response Relationship, RadiationTeleradiologyTransducersAnatomy, Cross-SectionalWrist JointCarbon RadioisotopesSeverity of Illness IndexRadiation EffectsCerebrovascular CirculationCraniocerebral TraumaCoronary Artery DiseaseBronchographyMacula LuteaLung NeoplasmsSpectrometry, X-Ray EmissionDiagnostic Techniques, OphthalmologicalDiagnostic ErrorsAngiographyPleuraGamma CamerasOptics and PhotonicsMetacarpophalangeal JointCalibrationSilicatesBone and BonesAluminum SilicatesMetacarpusMyocardial Perfusion ImagingAsbestosisForeign BodiesTibia