Carotid ArteriesBlood Flow VelocityCarotid Artery DiseasesCarotid Artery, InternalCarotid Artery, CommonCarotid StenosisCarotid Artery, ExternalEndarterectomy, CarotidArteriesCarotid Artery ThrombosisUltrasonography, Doppler, TranscranialCerebral ArteriesCerebrovascular CirculationRegional Blood FlowCarotid Artery, Internal, DissectionMiddle Cerebral ArteryCarotid BodyUltrasonography, DopplerTunica IntimaOphthalmic ArteryPulsatile FlowUltrasonography, Doppler, ColorCarotid SinusPulmonary ArteryCoronary CirculationFemoral ArteryTunica MediaUltrasonography, Doppler, DuplexCerebral AngiographyBlood PressureVertebral ArteryStentsBasilar ArteryArterial Occlusive DiseasesRenal ArteryEchocardiography, DopplerCarotid Intima-Media ThicknessMagnetic Resonance AngiographyUltrasonographyRheologyHemodynamicsCarotid Artery InjuriesCoronary VesselsUmbilical ArteriesTime FactorsAngiographyIschemic Attack, TransientUltrasonography, Doppler, PulsedAngioplasty, BalloonMesenteric ArteriesProspective StudiesAngiography, Digital SubtractionArteriosclerosisBrachial ArteryCerebrovascular DisordersSubclavian ArteryEndarterectomyDiastoleStrokeBrain IschemiaTomography, X-Ray ComputedRadial ArteryAngioplastyTreatment OutcomeCircle of WillisCoronary Artery BypassVasodilationVascular ResistanceRisk FactorsIliac ArteryLaser-Doppler FlowmetryPredictive Value of TestsModels, CardiovascularCatheterizationMuscle, Smooth, VascularIntracranial EmbolismCeliac ArteryFollow-Up StudiesReproducibility of ResultsVasodilator AgentsConstriction, PathologicDoppler EffectIntracranial AneurysmEndothelium, VascularEchoencephalographyMammary ArteriesAneurysmSensitivity and SpecificityMesenteric Artery, SuperiorSystoleIntracranial ArteriosclerosisFlow CytometryCoronary AngiographyCollateral CirculationRetinal ArteryHeart RateHemorheologyTemporal ArteriesReference ValuesCerebral Infarction