Posterior Cerebral ArteryInfarction, Posterior Cerebral ArteryCerebral ArteriesCircle of WillisCerebral InfarctionCerebral AngiographyMiddle Cerebral ArteryCerebral Arterial DiseasesThrombosisHemianopsiaInfarction, Middle Cerebral ArteryCerebrovascular CirculationIntracranial AneurysmAnterior Cerebral ArteryBasilar ArteryUltrasonography, Doppler, TranscranialVenous ThrombosisVertebral ArteryMagnetic Resonance AngiographyTomography, X-Ray ComputedMagnetic Resonance ImagingAneurysm, RupturedBrain IschemiaOccipital LobeArteriesMyocardial InfarctionBlood Flow VelocityDyslexia, AcquiredCarotid Artery, InternalEmbolization, TherapeuticVertebrobasilar InsufficiencyOphthalmoplegic MigraineInfarctionMoyamoya DiseaseBrainTonic PupilSubarachnoid HemorrhageAmobarbitalEchoencephalographyAnisocoriaArterial Occlusive DiseasesIntracranial Arteriovenous MalformationsCerebrovascular DisordersOculomotor Nerve DiseasesIntracranial Embolism and ThrombosisAngiography, Digital SubtractionHemiplegiaCollateral CirculationEclampsiaTreatment OutcomeCerebral RevascularizationDominance, CerebralCoronary ThrombosisStrokeIntracranial ThrombosisRetrospective StudiesIschemic Attack, TransientVasoconstrictionSinus Thrombosis, IntracranialCarotid Artery ThrombosisTime FactorsCarotid ArteriesCarotid StenosisRegional Blood FlowPulmonary ArteryBlood PressureFollow-Up StudiesMuscle, Smooth, VascularCerebral VeinsVasodilationThalamusIntracranial ArteriosclerosisFemoral ArteryTemporal LobeCerebral PalsyInfarction, Anterior Cerebral ArteryImage Processing, Computer-AssistedRenal ArteryCerebral HemorrhageMesenteric ArteriesReference ValuesThrombolytic TherapyDisease Models, AnimalArtifactsProspective StudiesRisk FactorsFibrinolytic AgentsAcute DiseaseCoronary Artery BypassBrain EdemaConstriction, PathologicCoronary AngiographyCarotid Artery DiseasesStentsAnticoagulantsCoronary VesselsHemodynamicsNeurologic ExaminationTemporal ArteriesAngioplasty, Balloon, Coronary