EchocardiographyEchocardiography, TransesophagealEchocardiography, Three-DimensionalEchocardiography, DopplerRadionuclide AngiographyEchocardiography, StressRadionuclide ImagingEchocardiography, Doppler, ColorRadioisotopesRadionuclide VentriculographyTechnetiumEchocardiography, Doppler, PulsedDobutamineRadionuclide GeneratorsVentricular Function, LeftStroke VolumeVentricular Dysfunction, LeftCesium RadioisotopesHeart VentriclesWater Pollutants, RadioactiveMitral ValveGated Blood-Pool ImagingSodium Pertechnetate Tc 99mHeart DiseasesStrontium RadioisotopesMitral Valve InsufficiencyExercise TestHeartRadiopharmaceuticalsDiastoleHeart Septal Defects, AtrialCardiac CatheterizationElectrocardiographySoil Pollutants, RadioactiveMyocardial ContractionHeart Valve DiseasesSensitivity and SpecificityHeart AtriaObserver VariationPredictive Value of TestsSystoleTomography, Emission-Computed, Single-PhotonHeart Defects, CongenitalVentriculography, First-PassRadiometryRadioactivityCardiac VolumeRheniumHeart NeoplasmsProspective StudiesContrast MediaHemodynamicsFeasibility StudiesCardiotonic AgentsCoronary CirculationAlpha ParticlesAortic ValveCineangiographyReproducibility of ResultsPlutoniumCoronary DiseasePentetic AcidAortic Valve InsufficiencyFetal HeartEchocardiography, Four-DimensionalMyocardial InfarctionIodine RadioisotopesRadioimmunotherapyBlood Flow VelocityHypertrophy, Left VentricularRadiation DosageFood Contamination, RadioactiveCardiomyopathiesDipyridamoleHeart SeptumIndium RadioisotopesHeart FailureTricuspid ValveVentricular Function, RightHeart Valve ProsthesisAngiocardiographyTricuspid Valve InsufficiencyYttrium RadioisotopesMyocardial IschemiaVentricular Dysfunction, RightHeart Function TestsHeart AneurysmBeta ParticlesAortic Valve StenosisFollow-Up StudiesRadiation MonitoringTime FactorsMitral Valve ProlapseMitral Valve StenosisCoronary AngiographyCardiomyopathy, DilatedAtrial Function, LeftVentricular RemodelingGold RadioisotopesTechnetium Tc 99m Sestamibi