Coronary CirculationNitrogen RadioisotopesRegional Blood FlowDogsOxygen RadioisotopesTomography, Emission-ComputedBlood Flow VelocityMicrospheresHeartHemodynamicsMyocardiumCoronary DiseaseDipyridamoleCoronary VesselsHyperemiaEndocardiumCollateral CirculationAmmoniaMyocardial IschemiaMyocardial ReperfusionHeart RateOrganotechnetium CompoundsMyocardial ContractionRadioisotopesMyocardial InfarctionBlood PressureOxygen ConsumptionAdenosineModels, CardiovascularMyocardial Reperfusion InjurySwineTime FactorsHeart VentriclesVascular ResistanceWaterNecrosisCerebrovascular CirculationStrontium RadioisotopesCerium RadioisotopesMyocardial StunningPositron-Emission TomographyMicrocirculationVasodilator AgentsDisease Models, AnimalMyocardial Perfusion ImagingDobutamineVasodilationLaser-Doppler FlowmetryRestDiatrizoate MeglumineFlow CytometryYtterbiumEchocardiographyOxygenScandiumBlood VolumeDiatrizoateRadiopharmaceuticalsVasomotor SystemRubidium RadioisotopesXenonSpectrometry, GammaPerfusionContrast MediaPulsatile FlowVentricular Function, LeftFluorine RadioisotopesCardiac OutputOximesFractional Flow Reserve, MyocardialTomography, Emission-Computed, Single-PhotonPericardiumCerium IsotopesXenon RadioisotopesThalliumPhysical ExertionImage Processing, Computer-AssistedCarbon DioxideCoronary StenosisReference ValuesRadionuclide GeneratorsDeoxyglucoseReproducibility of ResultsThallium RadioisotopesCoronary AngiographyTissue SurvivalPotassium RadioisotopesTechnetium Tc 99m SestamibiCarbon RadioisotopesRadioisotope Dilution TechniqueNitroglycerinVasoconstrictionCoronary Artery DiseaseCardiotonic AgentsRenal CirculationAdrenergic beta-1 Receptor AgonistsSulfur HexafluorideThiosemicarbazonesPapioLiver Circulation