Tomography, X-Ray ComputedPositron-Emission TomographyTomographyTomography, Emission-ComputedTomography, Optical CoherenceTomography, Emission-Computed, Single-PhotonTomography, Spiral ComputedFluorodeoxyglucose F18Tomography, OpticalMultidetector Computed TomographyCone-Beam Computed TomographyElectron Microscope TomographyOtoacoustic Emissions, SpontaneousTomography, X-RayFluorine RadioisotopesVehicle EmissionsTomography Scanners, X-Ray ComputedRadiopharmaceuticalsMultimodal ImagingSensitivity and SpecificityImaging, Three-DimensionalImage Processing, Computer-AssistedMagnetic Resonance ImagingBrainReproducibility of ResultsCarbon RadioisotopesPhantoms, ImagingGreenhouse EffectDiagnostic ImagingPredictive Value of TestsSpectrometry, FluorescenceCerebrovascular CirculationX-Ray MicrotomographyRadiographic Image Interpretation, Computer-AssistedCarbon FootprintOrganotechnetium CompoundsRetrospective StudiesTime FactorsAir PollutantsThallium RadioisotopesProspective StudiesTreatment OutcomeMethaneAlgorithmsFour-Dimensional Computed TomographyNitrogen RadioisotopesImage EnhancementRadioactive TracersCopper RadioisotopesTechnetium Tc 99m SestamibiRacloprideCoronary AngiographyRadiographic Image EnhancementRadiography, AbdominalAtmosphereContrast MediaMyocardial Perfusion ImagingEquipment DesignCalcinosisVolatilizationPentanesFluorescenceArtifactsRadiography, ThoracicDeoxyglucoseOximesTechnetium Tc 99m ExametazimeRadioisotopesCoronary Artery DiseaseFollow-Up StudiesFluorescent DyesRadiation DosageGallium RadioisotopesEnvironmental MonitoringLung NeoplasmsObserver VariationMacula LuteaOptical PhenomenaIodine RadioisotopesPhotonsLuminescenceGasolineMolecular ImagingSpectrometry, X-Ray EmissionTissue DistributionFossil FuelsHeartOxygen RadioisotopesDiagnostic Techniques, OphthalmologicalFeasibility StudiesIncidental FindingsCoronary CirculationLuminescent MeasurementsSolitary Pulmonary NoduleNeoplasm StagingCarbon DioxideIofetamineOptical ProcessesPrognosisPower Plants