Anterior Cerebral ArteryInfarction, Anterior Cerebral ArteryCerebral ArteriesCerebral AngiographyIntracranial AneurysmMiddle Cerebral ArteryCircle of WillisCerebral Arterial DiseasesInfarction, Middle Cerebral ArteryCerebral InfarctionArteriesSubarachnoid HemorrhageAneurysm, RupturedCerebrovascular CirculationCarotid Artery, InternalBasilar ArteryTomography, X-Ray ComputedUltrasonography, Doppler, TranscranialCarotid ArteriesMagnetic Resonance AngiographyBrain IschemiaBlood Flow VelocityVertebral ArteryCerebral RevascularizationIntracranial Embolism and ThrombosisEchoencephalographyVasospasm, IntracranialArterial Occlusive DiseasesIschemic Attack, TransientAngiography, Digital SubtractionPulmonary ArteryBrainEmbolization, TherapeuticNeurosurgical ProceduresIntracranial Arteriovenous MalformationsBrain Hemorrhage, TraumaticPosterior Cerebral ArteryCraniotomyDominance, CerebralAkinetic MutismIntracranial ArteriosclerosisCerebrovascular DisordersMoyamoya DiseaseRenal ArteryFemoral ArteryMagnetic Resonance ImagingMesenteric ArteriesAneurysm, DissectingCerebral HemorrhageUltrasonography, DopplerSurgical InstrumentsCarotid Artery DiseasesTreatment OutcomeRegional Blood FlowCarotid StenosisStrokeIliac ArteryCoronary Artery BypassCollateral CirculationHematomaRadial ArteryUltrasonographyMammary ArteriesFrontal LobeSubclavian ArteryTemporal ArteriesRetrospective StudiesCarotid Artery, CommonCerebral PalsyBrachial ArterySplenic ArteryUmbilical ArteriesVasoconstrictionTime FactorsFollow-Up StudiesHepatic ArteryCoronary VesselsOphthalmic ArteryPostoperative ComplicationsVasodilationMuscle, Smooth, VascularCeliac ArteryIntracranial EmbolismMesenteric Artery, SuperiorHematoma, SubduralCarotid Artery, ExternalBrain EdemaInfarction, Posterior Cerebral ArteryHemodynamicsInfant, NewbornCerebral VeinsBlood PressureRenal Artery ObstructionDisease Models, AnimalRats, Sprague-DawleyNeurologic ExaminationThoracic Arteries