PetsPositron-Emission TomographyFluorodeoxyglucose F18RadiopharmaceuticalsTomography, Emission-ComputedFluorine RadioisotopesMultimodal ImagingTomography, X-Ray ComputedSubtraction TechniqueOxygen RadioisotopesCopper RadioisotopesRadioactive TracersSensitivity and SpecificityRadiochemistryImage Processing, Computer-AssistedReproducibility of ResultsNitrogen RadioisotopesImage Interpretation, Computer-AssistedDihydroxyphenylalaninePhantoms, ImagingAnimals, DomesticBrainGallium RadioisotopesWhole-Body CountingTissue DistributionMagnetic Resonance ImagingImage EnhancementDideoxynucleosidesArtifactsNuclear MedicineDeoxyglucoseRacloprideRubidium RadioisotopesTomography, Emission-Computed, Single-PhotonThiosemicarbazonesIsotope LabelingLutetiumGermaniumMetabolic Clearance RateHeterocyclic Compounds, 1-RingOrganometallic CompoundsGamma CamerasNeoplasm StagingNeoplasmsMisonidazoleRadioisotopesBromine RadioisotopesFeasibility StudiesLung NeoplasmsCerebrovascular CirculationMolecular ImagingAlgorithmsRetrospective StudiesImaging, Three-DimensionalDogsDiagnostic ImagingIodine RadioisotopesSalicylamidesRespiratory-Gated Imaging TechniquesLymphatic MetastasisAniline CompoundsTomography Scanners, X-Ray ComputedReceptors, Dopamine D2PapioContrast MediaFlumazenilTetrabenazineHeartTime FactorsTreatment OutcomeThoracic NeoplasmsPredictive Value of TestsGlucoseBrain NeoplasmsSilicatesFalse Positive ReactionsAmmoniaNeoplasm Recurrence, LocalPrognosisHead and Neck NeoplasmsZirconiumNeuroendocrine TumorsDog DiseasesCholineCoronary CirculationSolitary Pulmonary NoduleRadionuclide GeneratorsBenperidolFalse Negative ReactionsChemistry Techniques, SyntheticBiological TransportAbdominal NeoplasmsPutamenProspective StudiesBone NeoplasmsMethionineZoonosesTumor BurdenEphedrineBrain Mapping