Gamma CamerasRadionuclide ImagingTechnetiumScintillation CountingOrganotechnetium CompoundsTantalumRadioisotopesTechnetium Tc 99m Aggregated AlbuminPhotographyMyocytes, CardiacRadiopharmaceuticalsTechnetium Tc 99m PentetateHeartIodine RadioisotopesTomography, Emission-Computed, Single-PhotonTechnetium Tc 99m MertiatideKryptonPentetic AcidIndiumCardiac OutputRadioisotope RenographyVentriculography, First-PassIndium RadioisotopesSodium Pertechnetate Tc 99mOximesTomography, Emission-ComputedPhantoms, ImagingWhole-Body CountingModels, StructuralAmericiumTechnology, RadiologicGastric EmptyingTissue DistributionThalliumArrhythmias, CardiacCardiac Surgical ProceduresIodohippuric AcidTechnetium Tc 99m Sulfur ColloidDeath, Sudden, CardiacRadionuclide GeneratorsTime FactorsTelluriumMercury RadioisotopesGold Colloid, RadioactiveImage Processing, Computer-AssistedEquipment DesignTechnetium Tc 99m ExametazimeXenon RadioisotopesRadioimmunodetectionEquipment Failure AnalysisEvaluation Studies as TopicTechnetium Tc 99m SestamibiRadiation DosageMiniaturizationMucociliary ClearanceSensitivity and SpecificityGated Blood-Pool ImagingGamma RaysTechnetium CompoundsHeart DiseasesCardiomegalyThallium RadioisotopesCardiac TamponadeRheniumMyocardiumCardiac Pacing, ArtificialFluorodeoxyglucose F18Video RecordingDogsIodobenzenesReproducibility of ResultsRadioimmunotherapyMyocardial ContractionComputersStroke VolumeCardiac CatheterizationHeart VentriclesHeart ArrestArtifactsRadiometryAntibodies, MonoclonalCalibrationTechnetium Tc 99m MedronateImage EnhancementAerosolsMyoblasts, CardiacCardiomyopathiesLungHeart FailureElectrocardiographyCardiac MyosinsCardiac Imaging TechniquesNebulizers and VaporizersHeart RateCardiac GlycosidesIsotope LabelingQuality ControlEchocardiographyAlgorithmsOrganophosphorus Compounds