Anterior Cerebral ArteryInfarction, Anterior Cerebral ArteryCerebral ArteriesIntracranial AneurysmCerebral AngiographyMiddle Cerebral ArteryCircle of WillisAneurysmSubarachnoid HemorrhageCerebral Arterial DiseasesCerebral InfarctionInfarction, Middle Cerebral ArteryCerebrovascular CirculationAneurysm, RupturedTomography, X-Ray ComputedCarotid Artery, InternalUltrasonography, Doppler, TranscranialBasilar ArteryEmbolization, TherapeuticAneurysm, DissectingAneurysm, InfectedMagnetic Resonance AngiographyBrain IschemiaAngiography, Digital SubtractionBlood Flow VelocityCerebral RevascularizationArteriesIntracranial Embolism and ThrombosisEchoencephalographyVasospasm, IntracranialNeurosurgical ProceduresAortic AneurysmCarotid ArteriesIschemic Attack, TransientIntracranial Arteriovenous MalformationsArterial Occlusive DiseasesVertebral ArteryBrainPosterior Cerebral ArteryBrain Hemorrhage, TraumaticCraniotomySurgical InstrumentsDominance, CerebralAkinetic MutismAortic Aneurysm, ThoracicCerebral HemorrhageHeart AneurysmMoyamoya DiseaseMagnetic Resonance ImagingIntracranial ArteriosclerosisCerebrovascular DisordersTreatment OutcomeUltrasonography, DopplerIliac AneurysmCollateral CirculationHematomaRegional Blood FlowStrokeCarotid Artery DiseasesCoronary AneurysmRetrospective StudiesPulmonary ArteryUltrasonographyRenal ArteryCarotid StenosisBlood Vessel Prosthesis ImplantationFrontal LobePostoperative ComplicationsAneurysm, FalseFollow-Up StudiesFemoral ArteryTime FactorsAortic RuptureIliac ArteryCerebral PalsyBlood Vessel ProsthesisMesenteric ArteriesAorta, AbdominalStentsHematoma, SubduralTemporal ArteriesVascular Surgical ProceduresEndovascular ProceduresIntracranial EmbolismCerebral VeinsAortographyNeurologic ExaminationSplenic ArteryBrain EdemaAngiographySubclavian ArteryAzygos VeinDisease Models, AnimalImaging, Three-DimensionalInfant, NewbornCoronary Artery BypassInfarction, Posterior Cerebral ArteryVasoconstriction