PhotonsTomography, Emission-Computed, Single-PhotonTomography, X-Ray ComputedPositron-Emission TomographyTomography, Emission-ComputedTomographyOrganotechnetium CompoundsRadiopharmaceuticalsTechnetium Tc 99m ExametazimeThallium RadioisotopesSensitivity and SpecificityOximesTomography, Optical CoherenceFluorodeoxyglucose F18TechnetiumIofetamineIodine RadioisotopesTomography, OpticalCerebrovascular CirculationTomography, Spiral ComputedBrainTechnetium Tc 99m SestamibiIodobenzenesReproducibility of ResultsMagnetic Resonance ImagingThalliumImage Processing, Computer-AssistedPhantoms, ImagingMultidetector Computed TomographyXenon RadioisotopesTechnetium Tc 99m PyrophosphateDiagnostic ImagingMultimodal ImagingCone-Beam Computed TomographyElectron Microscope TomographyTropanesOtoacoustic Emissions, SpontaneousPredictive Value of TestsTime FactorsAmphetaminesMyocardial Perfusion ImagingLimit of DetectionCardiac-Gated Single-Photon Emission Computer-Assisted TomographyImaging, Three-DimensionalFluorine RadioisotopesTomography, X-RayAlgorithmsHeartRadioisotopesImage EnhancementLightOrganometallic CompoundsEquipment DesignRadiationTomography Scanners, X-Ray ComputedAcetazolamideSpectrometry, FluorescenceOrganophosphorus CompoundsVehicle EmissionsMolecular ImagingGamma CamerasScattering, RadiationRadiation DosageRadioactive TracersExercise TestRadionuclide ImagingMonte Carlo MethodRetinal Rod Photoreceptor CellsFluorescent DyesCarbon RadioisotopesIndium RadioisotopesDopamine Plasma Membrane Transport ProteinsContrast MediaCoronary AngiographyProspective StudiesFrontal LobeCinanserinTissue DistributionTechnetium Tc 99m MedronateRetrospective StudiesPolymerase Chain ReactionNitrogen RadioisotopesFalse Positive ReactionsGallium RadioisotopesRegional Blood FlowTechnology, RadiologicEvaluation Studies as TopicRadiusROC CurveThalamic DiseasesVision, OcularDipyridamoleNortropanesSpectrometry, GammaFluorescenceTreatment OutcomeRadiometryEquipment Failure AnalysisCoronary CirculationFlumazenil