PerfusionPerfusion ImagingWarm IschemiaMyocardial Perfusion ImagingTomography, Emission-Computed, Single-PhotonChemotherapy, Cancer, Regional PerfusionCoronary CirculationCerebrovascular CirculationRegional Blood FlowTechnetium Tc 99m SestamibiOrganotechnetium CompoundsCold TemperatureContrast MediaTime FactorsMicrocirculationThermosensingHeartLaser-Doppler FlowmetryVentilation-Perfusion RatioMagnetic Resonance AngiographyBlood Flow VelocityIschemiaRadiopharmaceuticalsHeart Arrest, InducedThallium RadioisotopesTemperatureReperfusion InjuryHot TemperatureDipyridamoleMagnetic Resonance ImagingBlood VolumeHemodynamicsMyocardial IschemiaBody Temperature RegulationDogsOrgan Preservation SolutionsAdenosineSensitivity and SpecificityOximesExercise TestNitrogen RadioisotopesBody TemperatureLiver CirculationTomography, X-Ray ComputedImage Processing, Computer-AssistedBlood PressureReproducibility of ResultsBrainTechnetium Tc 99m ExametazimePulmonary CirculationSkin TemperatureImage EnhancementMyocardiumRats, Sprague-DawleyGated Blood-Pool ImagingSwineOrgan PreservationGadolinium DTPAOxygenOxygen ConsumptionLiverTomography, Emission-ComputedVasodilator AgentsHypothermia, InducedCold IschemiaPressureTechnetium Tc 99m Aggregated AlbuminRats, WistarCoronary AngiographyMicrospheresCardioplegic SolutionsCapillariesClimateImage Interpretation, Computer-AssistedThermoreceptorsCoronary VesselsCoronary DiseaseSpin LabelsCollateral CirculationSeasonsTissue SurvivalDisease Models, AnimalAcclimatizationKidneyExtracorporeal CirculationCardiac-Gated Single-Photon Emission Computer-Assisted TomographyMyocardial ReperfusionHindlimbHypothermiaPredictive Value of TestsRubidium RadioisotopesWarm-Up ExerciseVascular ResistanceThalliumRaffinoseTreatment OutcomeRenal CirculationConstrictionAnemia, Hemolytic, AutoimmuneCardiopulmonary Bypass