GadoliniumGadolinium DTPAPentetic AcidPerfusionContrast MediaPerfusion ImagingOrganometallic CompoundsMagnetic Resonance ImagingMyocardial Perfusion ImagingTechnetiumNephrogenic Fibrosing DermopathyIndiumMagnetic Resonance Imaging, CineAmericiumIndium RadioisotopesMeglumineHeterocyclic CompoundsImage EnhancementMagnetic Resonance AngiographyMetalloporphyrinsTomography, Emission-Computed, Single-PhotonIodohippuric AcidRadiopharmaceuticalsChelating AgentsRadioisotope RenographyEdema, CardiacYtterbiumCoronary CirculationOrganotechnetium CompoundsChemotherapy, Cancer, Regional PerfusionTissue DistributionSensitivity and SpecificityTime FactorsHeterocyclic Compounds, 1-RingMyocardiumAerosolsPredictive Value of TestsRegional Blood FlowIsotope LabelingReproducibility of ResultsCerebrovascular CirculationKupffer CellsPerilymphDogsTin RadioisotopesImage Interpretation, Computer-AssistedFibrosisCicatrixTechnetium Tc 99m SestamibiImage Processing, Computer-AssistedHeartBreath HoldingVentricular Function, LeftTechnetium Tc 99m Aggregated AlbuminMyocardial IschemiaMicrocirculationTomography, X-Ray ComputedBrainCisterna MagnaIohexolKidneyInjections, IntravenousRadiochemistryLungRadionuclide ImagingCardiomyopathiesStroke VolumeMyocardial InfarctionBrain NeoplasmsGallium RadioisotopesPhantoms, ImagingVentilation-Perfusion RatioCardiomyopathy, HypertrophicHypertension, RenovascularRats, Sprague-DawleyImaging, Three-DimensionalTomography, Emission-ComputedIodine RadioisotopesFeasibility StudiesSubarachnoid SpaceLaser-Doppler FlowmetryAdenosineMetabolic Clearance RateBlood Flow VelocityObserver VariationProspective StudiesSpectroscopy, Electron Energy-LossConvectionFerrosoferric OxideRadioactivityCardiac-Gated Imaging TechniquesHemodynamicsRadioimmunotherapyThallium RadioisotopesLiverRenal Artery ObstructionRats, WistarMechanoreceptorsRenal CirculationCoronary Angiography