Tomography Scanners, X-Ray ComputedTomography, X-Ray ComputedPositron-Emission TomographyTomographyTomography, Optical CoherenceTomography, Emission-ComputedTomography, Spiral ComputedPhantoms, ImagingCone-Beam Computed TomographyTomography, OpticalMultidetector Computed TomographyTomography, Emission-Computed, Single-PhotonElectron Microscope TomographyEquipment DesignImaging, Three-DimensionalReproducibility of ResultsSensitivity and SpecificityImage Processing, Computer-AssistedTomography, X-RayMagnetic Resonance ImagingEquipment Failure AnalysisFluorodeoxyglucose F18Radiation DosageScintillation CountingRadiographic Image Interpretation, Computer-AssistedRadiographyRadiographic Image EnhancementArtifactsGamma RaysImage EnhancementRadiometryAlgorithmsGermaniumLutetiumX-Ray Intensifying ScreensTransducersBrainX-Ray MicrotomographyFluorine RadioisotopesTelluriumContrast MediaPhotonsGamma CamerasComputer-Aided DesignDiagnostic ImagingTime FactorsPredictive Value of TestsObserver VariationSilicatesCalibrationProspective StudiesRetrospective StudiesMultimodal ImagingElectron Probe MicroanalysisPneumoconiosisFour-Dimensional Computed TomographyFeasibility StudiesUltrasonographyImage Interpretation, Computer-AssistedSubtraction TechniqueRadiography, ThoracicX-RaysElasmobranchiiWhole Body ImagingCadmium CompoundsScattering, RadiationSkates (Fish)Signal-To-Noise RatioRadiography, AbdominalCalcinosisCoronary AngiographyOptics and PhotonicsRadionuclide ImagingTechnology, RadiologicMonte Carlo MethodOxygen RadioisotopesTreatment OutcomeCarbon RadioisotopesFollow-Up StudiesMiniaturizationSemiconductorsRadiology Department, HospitalCoronary Artery DiseaseCosmic RadiationSpectrometry, X-Ray EmissionLungCerebrovascular CirculationFast NeutronsAnatomy, Cross-SectionalOptical ProcessesAngiographyMyocardial Perfusion ImagingComputer SimulationCardiac-Gated Imaging TechniquesSignal Processing, Computer-AssistedBody BurdenTeleradiologyLung NeoplasmsRadiation ProtectionSeverity of Illness Index