Magnetic Resonance AngiographyMagnetic Resonance ImagingAngiography, Digital SubtractionContrast MediaAngiographyCerebral AngiographyImaging, Three-DimensionalGadoliniumCoronary AngiographyGadolinium DTPAMagnetic Resonance SpectroscopySensitivity and SpecificityImage EnhancementCircle of WillisTomography, X-Ray ComputedUltrasonography, Doppler, DuplexCarotid StenosisIntracranial AneurysmCarotid Artery, InternalArterial Occlusive DiseasesCerebral Arterial DiseasesConstriction, PathologicArtifactsImage Interpretation, Computer-AssistedRenal Artery ObstructionVertebral ArteryVertebrobasilar InsufficiencyObserver VariationPredictive Value of TestsCerebral ArteriesMagnetic Resonance Imaging, CineImage Processing, Computer-AssistedReproducibility of ResultsAnterior Cerebral ArteryPosterior Cerebral ArteryOrganometallic CompoundsMeglumineProspective StudiesIntracranial Arteriovenous MalformationsIntracranial Arterial DiseasesPulmonary VeinsRenal ArteryEndarterectomy, CarotidCerebrovascular CirculationPreoperative CareCarotid ArteriesIntracranial ArteriosclerosisUltrasonography, Doppler, ColorCollateral CirculationBrainInfarction, Posterior Cerebral ArteryUltrasonography, Doppler, TranscranialRetrospective StudiesSeverity of Illness IndexFeasibility StudiesTibial ArteriesPeripheral Vascular DiseasesScimitar SyndromeCoronary VesselsBlood Flow VelocityAneurysm, RupturedTreatment OutcomeVertebral Artery DissectionEmbolization, TherapeuticPortographyBasilar ArteryMoyamoya DiseaseUltrasonography, DopplerVascular MalformationsCerebrovascular DisordersCarotid Artery DiseasesFluorescein AngiographyFibromuscular DysplasiaStentsLegRadiographic Image EnhancementDiagnostic ImagingLateral Medullary SyndromePhlebographyCarotid Artery, ExternalTime FactorsAortographyStrokeIliac ArteryEcho-Planar ImagingFollow-Up StudiesIncidental FindingsCerebral VeinsCeliac ArteryBrain IschemiaIschemic Attack, TransientVascular PatencyCoronary Artery DiseaseMiddle Cerebral ArteryHypertension, RenovascularVasculitis, Central Nervous SystemTakayasu ArteritisSingle-Blind MethodAortic Aneurysm, ThoracicCerebral Revascularization