Cerebral AngiographyCerebral ArteriesMiddle Cerebral ArteryInfarction, Middle Cerebral ArteryCerebral InfarctionAngiographyMagnetic Resonance AngiographyCerebrovascular CirculationAngiography, Digital SubtractionPosterior Cerebral ArteryIntracranial AneurysmCoronary AngiographyAnterior Cerebral ArterySubarachnoid HemorrhageBrain IschemiaArteriesTomography, X-Ray ComputedBasilar ArteryIntracranial Arteriovenous MalformationsIschemic Attack, TransientCarotid Artery, InternalVertebral ArteryCerebral VeinsCerebral Arterial DiseasesCerebral HemorrhageBrainCircle of WillisArterial Occlusive DiseasesCerebrovascular DisordersCerebral PalsyCarotid ArteriesMoyamoya DiseaseIntracranial Embolism and ThrombosisAneurysm, RupturedCerebral RevascularizationMagnetic Resonance ImagingCarotid Artery DiseasesCranial SinusesBlood Flow VelocityVasospasm, IntracranialUltrasonography, Doppler, TranscranialEmbolization, TherapeuticCarotid StenosisCentral Nervous System Vascular MalformationsTemporal ArteriesPulmonary ArteryMalaria, CerebralIntracranial ArteriosclerosisStrokeTime FactorsRadial ArteryTreatment OutcomeCraniotomyFluorescein AngiographyVertebrobasilar InsufficiencyContrast MediaNeurologic ExaminationRenal ArteryIntracranial EmbolismFemoral ArteryCollateral CirculationBrain EdemaConstriction, PathologicSinus Thrombosis, IntracranialProspective StudiesNeurosurgical ProceduresVasculitis, Central Nervous SystemInfarction, Anterior Cerebral ArteryEndarterectomyMesenteric ArteriesCarotid Artery ThrombosisSensitivity and SpecificityFollow-Up StudiesArteriovenous FistulaSurgical InstrumentsRetrospective StudiesInfarction, Posterior Cerebral ArteryBlindness, CorticalArteriovenous MalformationsHematoma, SubduralEpilepsy, Tonic-ClonicDisease Models, AnimalCoronary Artery BypassVasoconstrictionReperfusionVertebral Artery DissectionIliac ArteryCoronary VesselsRats, Sprague-DawleyRegional Blood FlowCavernous SinusNeuroprotective AgentsBlood PressureIntracranial HemorrhagesCatheterizationComaBrain InfarctionUltrasonographyHeadacheCranial Fossa, Anterior