Cerebrovascular CirculationXenon RadioisotopesRegional Blood FlowTomography, Emission-ComputedTechnetium Tc 99m ExametazimeBrainIofetamineTomography, Emission-Computed, Single-PhotonXenonOximesBlood Flow VelocityOxygen RadioisotopesOrganotechnetium CompoundsCerebral ArteriesAcetazolamideAmphetaminesCerebral InfarctionBrain IschemiaBlood VolumeAntipyrineCarbon DioxideCerebrovascular DisordersBlood Circulation TimeIntracranial PressureMagnetic Resonance ImagingKryptonMiddle Cerebral ArteryCerebral CortexIschemic Attack, TransientLaser-Doppler FlowmetryBlood PressureAutoradiographyOxygenUltrasonography, Doppler, TranscranialImage Processing, Computer-AssistedHypercapniaBrain MappingReference ValuesRadiopharmaceuticalsHyperventilationPositron-Emission TomographyFrontal LobeDominance, CerebralOxygen ConsumptionPartial PressurePapioSubarachnoid HemorrhageMicrospheresBrain EdemaElectroencephalographyTomography, X-Ray ComputedInfarction, Middle Cerebral ArteryVascular ResistanceHemodynamicsSpin LabelsRadioisotopesFunctional LateralityTime FactorsArterial Occlusive DiseasesBlood Gas AnalysisHemodilutionCarbon RadioisotopesHypoxia, BrainNitrous OxideReperfusionOccipital LobeBlood-Brain BarrierRestCerebral AngiographyBrain DiseasesParietal LobeIodine RadioisotopesCarotid Artery, InternalPerfusion ImagingPia MaterEchoencephalographyBasal GangliaTechnetiumNimodipineHomeostasisHypotensionCatsRats, Inbred StrainsCerebral Arterial DiseasesThalamusCortical Spreading DepressionMoyamoya DiseaseCarbonic Anhydrase InhibitorsGerbillinaeGlucoseBlood Volume DeterminationIntracranial Embolism and ThrombosisDogsCerebral RevascularizationMagnetic Resonance AngiographyCerebral HemorrhageCarotid ArteriesCaudate NucleusIsofluraneHydrocephalus, Normal Pressure