Carotid Artery, InternalCarotid StenosisMagnetic Resonance AngiographyCarotid ArteriesCarotid Artery DiseasesEndarterectomy, CarotidCarotid Artery, CommonCarotid Artery, ExternalCarotid Artery ThrombosisCerebral AngiographyCarotid Artery, Internal, DissectionUltrasonography, Doppler, DuplexAngiography, Digital SubtractionIschemic Attack, TransientArterial Occlusive DiseasesEndarterectomyCerebrovascular DisordersStentsCerebrovascular CirculationAngiographyStrokeUltrasonography, Doppler, TranscranialCerebral ArteriesAngioplastyTomography, X-Ray ComputedCarotid BodyIntracranial AneurysmBlood Flow VelocityArteriesCircle of WillisVertebral ArteryConstriction, PathologicCarotid Artery InjuriesCerebral RevascularizationAngioplasty, BalloonCavernous SinusIntracranial EmbolismIntracranial Embolism and ThrombosisTunica IntimaBrain IschemiaCarotid SinusAmaurosis FugaxUltrasonographyUltrasonography, Doppler, ColorCerebral InfarctionAneurysmTreatment OutcomeMiddle Cerebral ArteryCollateral CirculationIntracranial ArteriosclerosisTunica MediaOphthalmic ArteryRisk FactorsArteriosclerosisProspective StudiesFollow-Up StudiesAortic Valve StenosisCarotid Intima-Media ThicknessEmbolization, TherapeuticUltrasonography, DopplerFibromuscular DysplasiaTime FactorsSeverity of Illness IndexRetrospective StudiesBasilar ArteryPredictive Value of TestsCatheterizationPostoperative ComplicationsCoronary StenosisCarotid-Cavernous Sinus FistulaAuscultationEpistaxisMoyamoya DiseaseSensitivity and SpecificityRecurrenceMagnetic Resonance ImagingBalloon OcclusionAcetazolamidePetrous BoneRetinal Artery OcclusionAneurysm, RupturedRegional Blood FlowTemporal ArteriesHorner SyndromeCranial Nerve DiseasesHemodynamicsCranial Nerve InjuriesSpinal StenosisEmbolismAnterior Cerebral ArteryDoppler EffectAneurysm, FalseBlood PressureInjections, Intra-ArterialTracheal StenosisReproducibility of ResultsBrainCerebral Arterial DiseasesSubclavian ArteryObserver Variation