Basilar ArteryCarotid ArteriesVertebrobasilar InsufficiencyCarotid Artery, InternalCarotid Artery DiseasesVertebral ArteryCarotid Artery, CommonCarotid StenosisArteriesPosterior Cerebral ArteryInfarction, Posterior Cerebral ArteryCerebral AngiographyCerebral ArteriesIntracranial AneurysmCarotid Artery, ExternalMagnetic Resonance AngiographyCerebrovascular CirculationEndarterectomy, CarotidBrain Stem InfarctionsCarotid Artery ThrombosisSubarachnoid HemorrhageCerebral InfarctionIntracranial ArteriosclerosisAneurysm, RupturedBrain InfarctionEmbolization, TherapeuticPulmonary ArteryStrokeTomography, X-Ray ComputedBrain IschemiaMoyamoya DiseaseIschemic Attack, TransientArterial Occlusive DiseasesFemoral ArteryAngiography, Digital SubtractionVertebral Artery DissectionAngiographyCarotid Artery, Internal, DissectionUltrasonography, Doppler, TranscranialRenal ArteryMesenteric ArteriesStentsIntracranial EmbolismTreatment OutcomeAnterior Cerebral ArteryMagnetic Resonance ImagingCerebrovascular DisordersCarotid BodyCerebral RevascularizationCarotid SinusTunica IntimaRetrospective StudiesCoronary Artery BypassConstriction, PathologicVasodilationSubclavian ArteryFollow-Up StudiesIliac ArteryMuscle, Smooth, VascularRadial ArteryRisk FactorsCarotid Artery InjuriesProspective StudiesAneurysm, DissectingVasoconstrictionMammary ArteriesMiddle Cerebral ArteryTunica MediaBrachial ArteryAngioplasty, BalloonBrainCircle of WillisCarotid Intima-Media ThicknessUltrasonography, Doppler, DuplexOphthalmic ArteryTime FactorsVasospasm, IntracranialCoronary VesselsDogsArteriosclerosisPredictive Value of TestsVasodilator AgentsRegional Blood FlowAcute DiseaseEndothelium, VascularSplenic ArteryBlood PressureRecurrenceBlood CirculationIntracranial Embolism and ThrombosisHepatic ArteryAneurysmRabbitsAngioplastyBlood Flow VelocityEndarterectomyTemporal ArteriesCeliac ArteryCollateral CirculationCatheterization