Vertebral ArteryVertebrobasilar InsufficiencyBasilar ArteryVertebral Artery DissectionSubarachnoid Hemorrhage, TraumaticCerebral AngiographyMagnetic Resonance AngiographyIntracranial AneurysmArteriesAneurysm, DissectingAngioplasty, BalloonSubclavian ArteryStentsSubclavian Steal SyndromeCarotid ArteriesCerebral ArteriesPulmonary ArteryAngiography, Digital SubtractionCarotid Artery, InternalAngiographyArterial Occlusive DiseasesRenal ArteryFemoral ArteryMesenteric ArteriesTomography, X-Ray ComputedVertigoEmbolization, TherapeuticSubarachnoid HemorrhageCarotid Artery DiseasesLateral Medullary SyndromeIntracranial ArteriosclerosisAneurysm, RupturedMammary ArteriesIliac ArteryConstriction, PathologicCoronary Artery BypassCarotid Artery, CommonOccipital BoneTreatment OutcomeCerebral InfarctionRadial ArteryIschemic Attack, TransientCerebellar DiseasesMesenteric Artery, SuperiorCerebrovascular CirculationIntracranial Embolism and ThrombosisCerebrovascular DisordersCarotid Artery, Internal, DissectionMagnetic Resonance ImagingCervical VertebraeBrain Stem InfarctionsUltrasonography, Doppler, TranscranialHemifacial SpasmEchoencephalographyCervical AtlasSplenic ArteryBrain IschemiaNeck InjuriesCerebral RevascularizationBrachial ArteryFibromuscular DysplasiaFollow-Up StudiesInfarction, Posterior Cerebral ArteryHepatic ArteryCarotid Artery, ExternalAxisCarotid StenosisCircle of WillisPosterior Cerebral ArteryBrachiocephalic TrunkStrokeCeliac ArteryCoronary VesselsRetrospective StudiesAngioplastyAneurysm, FalseNerve Compression SyndromesOphthalmic ArteryCerebellumAneurysmPetrous BoneHeadacheUltrasonographyBlood Flow VelocityTrigeminal NeuralgiaUmbilical ArteriesMiddle Cerebral ArteryRenal Artery ObstructionTime FactorsThoracic ArteriesBrain InfarctionUltrasonography, Doppler, ColorUltrasonography, DopplerTemporal ArteriesRegional Blood FlowArteriovenous FistulaCerebral Hemorrhage, TraumaticBronchial ArteriesVascular Surgical ProceduresPopliteal Artery