Vertebral ArteryVertebral Artery DissectionVertebrobasilar InsufficiencyArteriesBasilar ArterySubclavian ArteryCerebral AngiographySubclavian Steal SyndromeLateral Medullary SyndromeCarotid ArteriesMagnetic Resonance AngiographyAneurysm, DissectingCerebral ArteriesPulmonary ArteryCarotid Artery, InternalAngiographyIntracranial AneurysmCervical VertebraeEmbolization, TherapeuticAngiography, Digital SubtractionBrain Stem InfarctionsCervical AtlasArterial Occlusive DiseasesNeck InjuriesSubarachnoid HemorrhageCarotid Artery, Internal, DissectionAxisRenal ArteryFemoral ArteryTomography, X-Ray ComputedMesenteric ArteriesFibromuscular DysplasiaAneurysm, RupturedOccipital BoneCarotid Artery, CommonMammary ArteriesCarotid Artery DiseasesCerebellar DiseasesStentsAneurysm, FalseAtlanto-Axial JointIliac ArteryCoronary Artery BypassConstriction, PathologicDoppler EffectPercussionCarotid Artery, ExternalVertigoRadial ArteryCerebral RevascularizationArteriovenous FistulaIntracranial ArteriosclerosisAneurysmUltrasonography, Doppler, ColorCerebral InfarctionTreatment OutcomeAtlanto-Occipital JointMastoidCerebrovascular CirculationUltrasonography, DopplerAngioplasty, BalloonMagnetic Resonance ImagingNeckWounds, StabSplenic ArteryBrachial ArteryUltrasonographyHemifacial SpasmRegional Blood FlowCerebellumFollow-Up StudiesBrain IschemiaUltrasonography, Doppler, DuplexHepatic ArteryCerebrovascular DisordersCarotid StenosisInfarctionUltrasonography, Doppler, TranscranialIntracranial Embolism and ThrombosisCoronary VesselsHeadacheBalloon OcclusionCeliac ArteryOphthalmic ArteryBone ScrewsSpinal InjuriesMesenteric Artery, SuperiorBrachiocephalic TrunkCarotid Artery InjuriesAngioplastyBlood Flow VelocityWounds, NonpenetratingUmbilical ArteriesMiddle Cerebral ArteryCentral Nervous System Vascular MalformationsRenal Artery ObstructionHypoglossal Nerve DiseasesCircle of WillisRetrospective StudiesAortic Arch Syndromes