Vertebral ArteryVertebral Artery DissectionVertebrobasilar InsufficiencyArteriesBasilar ArterySubclavian ArteryCerebral AngiographySubclavian Steal SyndromeLateral Medullary SyndromeCarotid ArteriesMagnetic Resonance AngiographyAneurysm, DissectingCerebral ArteriesAngiographyPulmonary ArteryCarotid Artery, InternalIntracranial AneurysmCervical VertebraeEmbolization, TherapeuticAngiography, Digital SubtractionBrain Stem InfarctionsCervical AtlasArterial Occlusive DiseasesNeck InjuriesSubarachnoid HemorrhageCarotid Artery, Internal, DissectionFemoral ArteryAxisTomography, X-Ray ComputedRenal ArteryMesenteric ArteriesFibromuscular DysplasiaAneurysm, RupturedCarotid Artery, CommonOccipital BoneMammary ArteriesCarotid Artery DiseasesCerebellar DiseasesStentsAneurysm, FalseIliac ArteryAtlanto-Axial JointCoronary Artery BypassConstriction, PathologicDoppler EffectPercussionCarotid Artery, ExternalRadial ArteryArteriovenous FistulaCerebral RevascularizationVertigoTreatment OutcomeIntracranial ArteriosclerosisUltrasonography, Doppler, ColorAneurysmCerebral InfarctionAtlanto-Occipital JointMastoidAngioplasty, BalloonCerebrovascular CirculationMagnetic Resonance ImagingUltrasonography, DopplerNeckWounds, StabRegional Blood FlowUltrasonographySplenic ArteryFollow-Up StudiesBrachial ArteryCoronary VesselsHemifacial SpasmUltrasonography, Doppler, DuplexCerebellumHepatic ArteryBrain IschemiaCerebrovascular DisordersInfarctionCarotid StenosisUltrasonography, Doppler, TranscranialIntracranial Embolism and ThrombosisHeadacheBone ScrewsBalloon OcclusionCeliac ArteryMesenteric Artery, SuperiorSpinal InjuriesOphthalmic ArteryCarotid Artery InjuriesBlood Flow VelocityBrachiocephalic TrunkAngioplastyTime FactorsRetrospective StudiesWounds, NonpenetratingCircle of WillisMiddle Cerebral ArteryUmbilical ArteriesCentral Nervous System Vascular MalformationsRenal Artery ObstructionRupture, Spontaneous