Circle of WillisCerebral ArteriesCerebrovascular CirculationCerebral InfarctionCerebral AngiographyCerebral PalsyCollateral CirculationMagnetic Resonance AngiographyMiddle Cerebral ArteryBrainDNA, CircularBrain IschemiaManagement Quality CirclesNeuroendoscopyCarotid Artery, InternalMoyamoya DiseaseInfarction, Middle Cerebral ArteryBasilar ArteryIntracranial AneurysmMalaria, CerebralAngiography, Digital SubtractionCerebral VeinsDoppler EffectIschemic Attack, TransientVertebral ArteryBlood Flow VelocityCerebral HemorrhageCerebrovascular DisordersIntracranial ArteriosclerosisSubarachnoid HemorrhageUltrasonography, Doppler, TranscranialCarotid StenosisDominance, CerebralHistory, 17th CenturyIntracranial Arteriovenous MalformationsCarotid Artery, ExternalPia MaterSphenoid BoneArachnoidArterial Occlusive DiseasesTomography, X-Ray ComputedMigraine with AuraEchoencephalographyOphthalmic ArteryMagnetic Resonance ImagingStrokeImage Processing, Computer-AssistedAnterior Cerebral ArteryCranial Fossa, PosteriorCarotid ArteriesCarotid-Cavernous Sinus FistulaCerebral Amyloid AngiopathyPosterior Cerebral ArterySkull BaseImaging, Three-DimensionalCerebral VentriclesRegional Blood FlowBrain EdemaCarotid Artery DiseasesIntracranial Embolism and ThrombosisUltrasonography, Doppler, ColorBrain DiseasesCadaverIntracranial PressureEndarterectomy, CarotidCerebral RevascularizationCerebrumVasospasm, IntracranialTime FactorsReference ValuesUltrasonographyContrast MediaHypoxia, BrainNamibiaNeuroprotective AgentsDisease Models, AnimalXenon RadioisotopesProspective StudiesCarbon DioxideRats, Sprague-DawleySensitivity and SpecificityOxygenBlood-Brain BarrierSpectroscopy, Near-InfraredBlood PressureReperfusionDNA ReplicationTomography, Emission-ComputedPerceptual ClosureNeuronsBlood VolumeNucleic Acid Amplification TechniquesIntracranial ThrombosisBrain InfarctionTechnetium Tc 99m ExametazimeAcetazolamideGene Rearrangement, T-LymphocyteBrain ChemistryPlasmidsBase Sequence