Magnetic Resonance AngiographyMagnetic FieldsMagneticsMagnetic Resonance ImagingAngiography, Digital SubtractionContrast MediaAngiographyElectromagnetic FieldsCerebral AngiographyImaging, Three-DimensionalGadoliniumMagnetic Resonance SpectroscopyGadolinium DTPACoronary AngiographyImage EnhancementSensitivity and SpecificityCircle of WillisTomography, X-Ray ComputedUltrasonography, Doppler, DuplexCarotid StenosisIntracranial AneurysmArtifactsCarotid Artery, InternalArterial Occlusive DiseasesImage Interpretation, Computer-AssistedCerebral Arterial DiseasesConstriction, PathologicReproducibility of ResultsRenal Artery ObstructionImage Processing, Computer-AssistedVertebral ArteryVertebrobasilar InsufficiencyPredictive Value of TestsObserver VariationCerebral ArteriesMagnetic Resonance Imaging, CineMagnetic Field TherapyOrganometallic CompoundsAnterior Cerebral ArteryElectric WiringPosterior Cerebral ArteryMeglumineProspective StudiesIntracranial Arteriovenous MalformationsBrainIntracranial Arterial DiseasesPulmonary VeinsRenal ArteryCerebrovascular CirculationEndarterectomy, CarotidPreoperative CareCarotid ArteriesIntracranial ArteriosclerosisUltrasonography, Doppler, ColorCollateral CirculationFeasibility StudiesInfarction, Posterior Cerebral ArteryTime FactorsUltrasonography, Doppler, TranscranialRetrospective StudiesSeverity of Illness IndexBlood Flow VelocityTreatment OutcomeTibial ArteriesEcho-Planar ImagingPeripheral Vascular DiseasesCoronary VesselsScimitar SyndromeAneurysm, RupturedVertebral Artery DissectionEmbolization, TherapeuticPortographyPhantoms, ImagingBasilar ArteryDiagnostic ImagingMoyamoya DiseaseUltrasonography, DopplerVascular MalformationsCerebrovascular DisordersCarotid Artery DiseasesFluorescein AngiographyFibromuscular DysplasiaStentsRadiographic Image EnhancementLegLateral Medullary SyndromePhlebographyAlgorithmsCarotid Artery, ExternalAortographyStrokeFollow-Up StudiesIliac ArteryIncidental FindingsCerebral VeinsCeliac ArteryBrain IschemiaIschemic Attack, TransientVascular PatencyCoronary Artery Disease