Tomography, X-Ray ComputedPositron-Emission TomographyTomographyTomography, Emission-ComputedTomography, Optical CoherenceTomography, Spiral ComputedTomography, Emission-Computed, Single-PhotonTomography, OpticalMultidetector Computed TomographyFluorodeoxyglucose F18Cone-Beam Computed TomographyElectron Microscope TomographyTomography, X-RayTomography Scanners, X-Ray ComputedImaging, Three-DimensionalFluorine RadioisotopesSensitivity and SpecificityMultimodal ImagingOtoacoustic Emissions, SpontaneousImage Processing, Computer-AssistedMagnetic Resonance ImagingReproducibility of ResultsPhantoms, ImagingBrainX-Ray MicrotomographyPredictive Value of TestsDiagnostic ImagingVehicle EmissionsCarbon RadioisotopesRadiographic Image Interpretation, Computer-AssistedRadiopharmaceuticalsRetrospective StudiesCerebrovascular CirculationFour-Dimensional Computed TomographyProspective StudiesTreatment OutcomeContrast MediaRadiography, AbdominalRadiographic Image EnhancementTime FactorsCalcinosisAlgorithmsCoronary AngiographyOrganotechnetium CompoundsRadiography, ThoracicImage EnhancementThallium RadioisotopesMacula LuteaEquipment DesignCoronary Artery DiseaseOxygen RadioisotopesObserver VariationDiagnostic Techniques, OphthalmologicalFollow-Up StudiesRadiation DosageArtifactsGreenhouse EffectNitrogen RadioisotopesTechnetium Tc 99m SestamibiSpectrometry, FluorescenceRadioactive TracersCopper RadioisotopesMyocardial Perfusion ImagingOptical PhenomenaRacloprideLung NeoplasmsBronchographyIncidental FindingsAnatomy, Cross-SectionalNerve FibersFeasibility StudiesOptic DiskSolitary Pulmonary NoduleGallium RadioisotopesRadioisotopesDeoxyglucoseOximesTechnetium Tc 99m ExametazimeIodine RadioisotopesPrognosisNeoplasm StagingCarbon FootprintHeartAngiographySeverity of Illness IndexMolecular ImagingCoronary CirculationTissue DistributionOptical ProcessesEquipment Failure AnalysisAir PollutantsVisual AcuityPreoperative CareCoronary StenosisCoronary VesselsUltrasonographySubtraction TechniqueROC CurveFluorescein AngiographyAortography