PerfusionPerfusion ImagingMyocardial Perfusion ImagingReproducibility of ResultsTomography, Emission-Computed, Single-PhotonSensitivity and SpecificityCoronary CirculationChemotherapy, Cancer, Regional PerfusionCerebrovascular CirculationContrast MediaRegional Blood FlowImage Processing, Computer-AssistedTechnetium Tc 99m SestamibiOrganotechnetium CompoundsMagnetic Resonance ImagingTandem Mass SpectrometryRadiopharmaceuticalsImage Interpretation, Computer-AssistedChromatography, LiquidReference StandardsTime FactorsLimit of DetectionHeartMagnetic Resonance AngiographyBlood Flow VelocityCalibrationImage EnhancementAlgorithmsMicrocirculationChromatography, High Pressure LiquidBrainTomography, X-Ray ComputedLaser-Doppler FlowmetryVentilation-Perfusion RatioNitrogen RadioisotopesThallium RadioisotopesMass SpectrometryBlood VolumeDogsTomography, Emission-ComputedDipyridamoleImaging, Three-DimensionalGadolinium DTPAPositron-Emission TomographyOximesPolymerase Chain ReactionMyocardiumHemodynamicsMyocardial IschemiaIsotope LabelingPulmonary CirculationMicrospheresFeasibility StudiesAdenosineRats, Sprague-DawleyArtifactsGated Blood-Pool ImagingSwinePredictive Value of TestsObserver VariationPhantoms, ImagingTechnetium Tc 99m ExametazimeBlood PressureIschemiaMagnetic Resonance Imaging, CineExercise TestTechnetium Tc 99m Aggregated AlbuminLiverOxygenCoronary AngiographyVasodilator AgentsSpin LabelsAutomationOrgan PreservationRats, WistarDisease Models, AnimalSpectrometry, Mass, Electrospray IonizationCoronary VesselsOxygen RadioisotopesReference ValuesAutomation, LaboratoryProteomicsCapillariesRubidium RadioisotopesCoronary DiseaseVentricular Function, LeftReal-Time Polymerase Chain ReactionTechnetiumCoronary Artery DiseaseGas Chromatography-Mass SpectrometryCollateral CirculationProspective StudiesPressureFluorescent DyesLiver CirculationSolid Phase ExtractionRabbitsModels, CardiovascularOrganophosphorus CompoundsRadiographic Image Interpretation, Computer-Assisted