Cerebrovascular CirculationXenon RadioisotopesTomography, Emission-ComputedRegional Blood FlowOxygenBrainOxygen RadioisotopesTechnetium Tc 99m ExametazimeIofetamineBlood Flow VelocityOxygen ConsumptionTomography, Emission-Computed, Single-PhotonXenonOximesBlood VolumeOrganotechnetium CompoundsCerebral ArteriesAcetazolamideBrain IschemiaBlood Circulation TimeCarbon DioxideAmphetaminesMagnetic Resonance ImagingCerebral InfarctionAntipyrineCerebrovascular DisordersCerebral CortexHypercapniaIntracranial PressureKryptonMiddle Cerebral ArteryLaser-Doppler FlowmetryIschemic Attack, TransientPositron-Emission TomographyBlood PressureHemodynamicsImage Processing, Computer-AssistedAutoradiographyReference ValuesUltrasonography, Doppler, TranscranialArterial Occlusive DiseasesSpectroscopy, Near-InfraredRadiopharmaceuticalsBrain MappingPartial PressureHyperventilationFrontal LobeDominance, CerebralPapioTime FactorsSubarachnoid HemorrhageMicrospheresElectroencephalographyBrain EdemaTomography, X-Ray ComputedVascular ResistanceCarbon RadioisotopesInfarction, Middle Cerebral ArteryBlood Gas AnalysisSpin LabelsRadioisotopesHypoxia, BrainNitrous OxideOximetryHemodilutionFunctional LateralityGlucoseReperfusionRestBlood-Brain BarrierOxyhemoglobinsOccipital LobeReactive Oxygen SpeciesBrain DiseasesCerebral AngiographyHomeostasisParietal LobeIodine RadioisotopesHemoglobinsRats, Inbred StrainsPerfusion ImagingCarotid Artery, InternalPia MaterTechnetiumEchoencephalographyBasal GangliaNimodipineDogsCatsHypotensionRats, Sprague-DawleyCerebral Arterial DiseasesBlood Volume DeterminationCortical Spreading DepressionThalamusHydrogen PeroxideMoyamoya DiseaseCarbonic Anhydrase InhibitorsGerbillinaeIntracranial Embolism and Thrombosis