Cerebrovascular CirculationIschemic Attack, TransientXenon RadioisotopesTomography, Emission-ComputedBrainTechnetium Tc 99m ExametazimeIofetamineTomography, Emission-Computed, Single-PhotonCerebral ArteriesOximesXenonRegional Blood FlowCerebrovascular DisordersCerebral InfarctionOxygen RadioisotopesBrain IschemiaAcetazolamideOrganotechnetium CompoundsBlood VolumeAmphetaminesStrokeBlood Flow VelocityMagnetic Resonance ImagingAntipyrineCarbon DioxideMiddle Cerebral ArteryIntracranial PressureCerebral AngiographyBlood Circulation TimeCerebral CortexKryptonTomography, X-Ray ComputedTime FactorsCarotid StenosisUltrasonography, Doppler, TranscranialImage Processing, Computer-AssistedAutoradiographyBrain MappingInfarction, Middle Cerebral ArteryRadiopharmaceuticalsBlood PressureCarotid Artery DiseasesDominance, CerebralCarotid Artery, InternalOxygenReference ValuesSubarachnoid HemorrhagePositron-Emission TomographyIntracranial Embolism and ThrombosisCerebral HemorrhageFrontal LobeArterial Occlusive DiseasesMoyamoya DiseaseHypercapniaHyperventilationBrain EdemaBlood Volume DeterminationElectroencephalographyLaser-Doppler FlowmetryCarotid ArteriesMagnetic Resonance AngiographyCerebral RevascularizationPapioOxygen ConsumptionPartial PressureCerebral PalsyFunctional LateralityBrain DiseasesReperfusionBlood-Brain BarrierCerebral Arterial DiseasesHypoxia, BrainCarbon RadioisotopesOccipital LobeCerebral VeinsRadioisotopesHemodynamicsNitrous OxideNeurologic ExaminationParietal LobeSpin LabelsEndarterectomy, CarotidBasal GangliaHemodilutionMicrospheresTechnetiumProspective StudiesIodine RadioisotopesFollow-Up StudiesBlood Gas AnalysisPia MaterRestGlucoseThalamusSpectroscopy, Near-InfraredGerbillinaeRisk FactorsNimodipinePerfusion ImagingRats, Inbred Strains