Intracranial Arterial DiseasesConstriction, PathologicArterial Occlusive DiseasesCerebral Arterial DiseasesCarotid StenosisIntracranial ArteriosclerosisAortic Valve StenosisCoronary StenosisRenal Artery ObstructionSpinal StenosisCerebral AngiographyTracheal StenosisMagnetic Resonance AngiographyAngioplasty, BalloonAngiography, Digital SubtractionStentsIliac ArteryPyloric StenosisAngiographyMitral Valve StenosisPulmonary Valve StenosisVertebrobasilar InsufficiencyIschemic Attack, TransientStrokeCollateral CirculationArteriosclerosis ObliteransCoronary AngiographyBrain IschemiaUltrasonography, Doppler, TranscranialCerebral ArteriesCoronary OcclusionBlood Flow VelocityBalloon OcclusionCarotid Artery DiseasesRenal ArteryRetinal Artery OcclusionCerebrovascular CirculationRecurrenceTomography, X-Ray ComputedFollow-Up StudiesRetinal Vein OcclusionCarotid Artery, InternalCerebrovascular DisordersHemodynamicsPredictive Value of TestsCarotid ArteriesArteriesSeverity of Illness IndexUltrasonography, Doppler, ColorRegional Blood FlowTime FactorsSensitivity and SpecificityAspirinProspective StudiesRetrospective StudiesModels, CardiovascularTreatment OutcomeRisk FactorsGraft Occlusion, VascularAortic Stenosis, SubvalvularUltrasonography, Doppler, DuplexDental OcclusionAortic Stenosis, SupravalvularEndarterectomy, CarotidBlood PressureReproducibility of ResultsCatheterizationCoronary CirculationInfarction, Middle Cerebral ArteryCoronary DiseaseAortic ValveLaryngostenosisCoronary VesselsTricuspid Valve StenosisVascular PatencyMesenteric Vascular OcclusionAngioplastyCerebral InfarctionDiscrete Subaortic StenosisCardiac CatheterizationDogsConstrictionPyloric Stenosis, HypertrophicHeart Valve Prosthesis ImplantationPostoperative ComplicationsEsophageal StenosisCarotid Artery, ExternalDental Occlusion, CentricCarotid Artery ThrombosisEmbolization, TherapeuticEchocardiographyFemoral ArteryIschemiaTherapeutic OcclusionEndarterectomyAngioplasty, Balloon, CoronaryMyocardial InfarctionDisease Models, AnimalCalcinosisFractional Flow Reserve, Myocardial