Carbon RadioisotopesPositron-Emission TomographyTomography, Emission-ComputedRadioisotopesCarbonFluorodeoxyglucose F18RadiopharmaceuticalsZinc RadioisotopesFluorine RadioisotopesMultimodal ImagingOxygen RadioisotopesCopper RadioisotopesCarbon DioxideIodine RadioisotopesRadioisotope Dilution TechniqueTomography, X-Ray ComputedStrontium RadioisotopesBrainCarbon MonoxideNitrogen RadioisotopesKrypton RadioisotopesIndium RadioisotopesNanotubes, CarbonRadionuclide ImagingMagnetic Resonance ImagingRacloprideIsotope LabelingTomography, Emission-Computed, Single-PhotonTissue DistributionCerebrovascular CirculationSodium RadioisotopesYttrium RadioisotopesRadioactive TracersCarbon IsotopesSensitivity and SpecificityDeoxyglucoseRadioactivityBarium RadioisotopesTin RadioisotopesTechnetiumGallium RadioisotopesIron RadioisotopesHeterocyclic Compounds, 1-RingPhosphorus RadioisotopesGlucoseOtoacoustic Emissions, SpontaneousBeta ParticlesWhole Body ImagingDiagnostic ImagingLutetiumRubidium RadioisotopesDihydroxyphenylalanineImage Processing, Computer-AssistedNuclear MedicineCarbon Monoxide PoisoningTechnetium Tc 99m Sulfur ColloidMercury RadioisotopesReproducibility of ResultsScintillation CountingCesium IsotopesCerium RadioisotopesCobalt IsotopesHafniumAniline CompoundsTime FactorsBromine RadioisotopesGold RadioisotopesRadioimmunotherapyMisonidazoleReceptors, Dopamine D2Vehicle EmissionsOrganometallic CompoundsLead RadioisotopesBrain MappingCoronary CirculationPredictive Value of TestsDiagnostic Techniques, RadioisotopeZinc IsotopesSulfur RadioisotopesNeoplasm StagingAstatineAutoradiographySalicylamidesCadmium RadioisotopesFlumazenilRheniumPapioRadiochemistryMolecular ImagingCarbon FootprintSamariumIsotopesLung NeoplasmsCarbon SequestrationRadiometryTetrabenazinePentetic AcidPapio anubisSoil Pollutants, RadioactiveKinetics