Tomography, OpticalTomography, X-Ray ComputedTomographyTomography, Optical CoherencePositron-Emission TomographyDoppler EffectPhantoms, ImagingEquipment DesignOptical ProcessesTomography, Emission-ComputedEquipment Failure AnalysisPhotoacoustic TechniquesImaging, Three-DimensionalTomography, Emission-Computed, Single-PhotonImage Processing, Computer-AssistedTomography, Spiral ComputedFluorodeoxyglucose F18Image EnhancementReproducibility of ResultsMultidetector Computed TomographySensitivity and SpecificityCone-Beam Computed TomographyElectron Microscope TomographyOtoacoustic Emissions, SpontaneousAlgorithmsTomography, X-RayFluorine RadioisotopesVehicle EmissionsTomography Scanners, X-Ray ComputedRadiopharmaceuticalsMultimodal ImagingMagnetic Resonance ImagingBrainCarbon RadioisotopesGreenhouse EffectDiagnostic ImagingPredictive Value of TestsSpectrometry, FluorescenceCerebrovascular CirculationX-Ray MicrotomographyRadiographic Image Interpretation, Computer-AssistedCarbon FootprintOrganotechnetium CompoundsRetrospective StudiesTime FactorsAir PollutantsThallium RadioisotopesProspective StudiesTreatment OutcomeMethaneFour-Dimensional Computed TomographyNitrogen RadioisotopesRadioactive TracersCopper RadioisotopesTechnetium Tc 99m SestamibiRacloprideCoronary AngiographyRadiographic Image EnhancementRadiography, AbdominalAtmosphereContrast MediaMyocardial Perfusion ImagingCalcinosisVolatilizationPentanesFluorescenceArtifactsRadiography, 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 Dioxide