Tomography, X-Ray ComputedPositron-Emission TomographyTomography, Emission-ComputedTomographyTomography, Optical CoherenceTomography, Emission-Computed, Single-PhotonFluorodeoxyglucose F18Tomography, Spiral ComputedMultidetector Computed TomographyTomography, OpticalCone-Beam Computed TomographyElectron Microscope TomographyOtoacoustic Emissions, SpontaneousRadiopharmaceuticalsTomography Scanners, X-Ray ComputedImaging, Three-DimensionalTomography, X-RayMultimodal ImagingFluorine RadioisotopesSensitivity and SpecificityMagnetic Resonance ImagingRadiography, AbdominalImage Processing, Computer-AssistedVehicle EmissionsReproducibility of ResultsBrainTreatment OutcomePredictive Value of TestsRetrospective StudiesRadiography, ThoracicProspective StudiesTime FactorsRadiographic Image Interpretation, Computer-AssistedPhantoms, ImagingCarbon RadioisotopesFollow-Up StudiesCerebrovascular CirculationIncidental FindingsDiagnostic ImagingGreenhouse EffectAortographyBronchographySpectrometry, FluorescenceLung NeoplasmsX-Ray MicrotomographyCalcinosisRadiation DosageAlgorithmsOrganotechnetium CompoundsAnatomy, Cross-SectionalObserver VariationSolitary Pulmonary NoduleFatal OutcomeContrast MediaMultiple Pulmonary NodulesCarbon FootprintAbdominal PainThallium RadioisotopesImage EnhancementPrognosisMediastinumAir PollutantsNeoplasm StagingRadiographic Image EnhancementBiopsyFour-Dimensional Computed TomographyAortic Aneurysm, AbdominalModels, AnatomicHematomaArtifactsMethaneGallium RadioisotopesTechnetium Tc 99m SestamibiPreoperative CareBlood Vessel Prosthesis ImplantationNitrogen RadioisotopesSeverity of Illness IndexRadioactive TracersBronchoscopyLungAngiographyFeasibility StudiesCopper RadioisotopesEquipment DesignMediastinal NeoplasmsCoronary AngiographyMyocardial Perfusion ImagingRacloprideTechnetium Tc 99m ExametazimeOximesLiver NeoplasmsWounds, NonpenetratingRadioisotopesIodine RadioisotopesAtmosphereAnimal CommunicationSkullVolatilizationFluorescenceCoronary Artery Disease