Coronary CirculationRegional Blood FlowRestHyperemiaNitrogen RadioisotopesTomography, Emission-ComputedBlood Flow VelocityDogsCoronary VesselsOxygen RadioisotopesHemodynamicsDipyridamoleMicrospheresHeartVascular ResistanceAmmoniaBlood PressureOxygen ConsumptionMyocardiumAdenosineCerebrovascular CirculationHeart RateCoronary DiseaseStrontium RadioisotopesVasodilationCerium RadioisotopesMicrocirculationLaser-Doppler FlowmetryEndocardiumCollateral CirculationVasodilator AgentsMyocardial StunningPhysical ExertionMyocardial IschemiaPositron-Emission TomographyMyocardial Perfusion ImagingDobutamineCardiac OutputTime FactorsOrganotechnetium CompoundsOxygenMyocardial ReperfusionMyocardial ContractionDiatrizoate MeglumineEchocardiographyModels, CardiovascularExerciseYtterbiumVentricular Function, LeftRubidium RadioisotopesSwineSpectrometry, GammaForearmMyocardial InfarctionRadiopharmaceuticalsDiatrizoateScandiumRadioisotopesVasoconstrictionBlood VolumeFractional Flow Reserve, MyocardialFluorine RadioisotopesVasomotor SystemThalliumSympathetic Nervous SystemContrast MediaPulmonary CirculationBed RestHeart VentriclesPericardiumCerium IsotopesPerfusionExercise TestMuscle, SkeletalTomography, Emission-Computed, Single-PhotonWaterLegCoronary StenosisReference ValuesThallium RadioisotopesCoronary AngiographyImage Processing, Computer-AssistedOximesReproducibility of ResultsRadionuclide GeneratorsDeoxyglucoseXenonTechnetium Tc 99m Sestamibi