Angiography, Digital SubtractionMasksSubtraction TechniqueMagnetic Resonance AngiographyCerebral AngiographyAngiographyLaryngeal MasksIntracranial AneurysmCoronary AngiographyRadiographic Image EnhancementImaging, Three-DimensionalContrast MediaIntracranial Arteriovenous MalformationsTomography, X-Ray ComputedSensitivity and SpecificityEmbolization, TherapeuticCarotid Artery, InternalImage Processing, Computer-AssistedAneurysm, RupturedCentral Nervous System Vascular MalformationsArterial Occlusive DiseasesCarotid StenosisSubarachnoid HemorrhageTomography, Spiral ComputedCerebral VeinsReproducibility of ResultsIohexolSalivary Gland CalculiFluorescein AngiographyIopamidolUltrasonography, Doppler, DuplexObserver VariationRadiographic Image Interpretation, Computer-AssistedConstriction, PathologicUltrasonography, Doppler, ColorRadiography, Dental, DigitalArteriovenous MalformationsCerebral ArteriesArtifactsVertebrobasilar InsufficiencyX-Ray Intensifying ScreensPredictive Value of TestsCarotid Artery DiseasesGadolinium DTPAAnterior Cerebral ArteryMagnetic Resonance ImagingProspective StudiesTriiodobenzoic AcidsCarotid-Cavernous Sinus FistulaRetrospective StudiesVertebral ArteryTibial ArteriesSurgical InstrumentsCranial SinusesImage EnhancementVasospasm, IntracranialCerebrovascular DisordersBasilar ArteryRadiography, InterventionalUltrasonography, Doppler, TranscranialInjections, Intra-ArterialArteriovenous FistulaTreatment OutcomeAneurysmSialographyEquipment DesignMyelographyCerebrovascular CirculationCircle of WillisCerebral RevascularizationRenal ArteryIothalamate MeglumineCarotid ArteriesIntracranial ArteriosclerosisNeurosurgical ProceduresSalivary Gland DiseasesFeasibility StudiesRadiation DosageFollow-Up StudiesBlood Flow VelocityRadiography, BitewingCarotid Artery, ExternalMoyamoya DiseaseTime FactorsPhantoms, ImagingRadionuclide AngiographyVascular PatencyStentsCollateral CirculationAortographyUltrasonographyAngioplasty, BalloonGadoliniumSialadenitisRespiratory Protective DevicesImmediate Dental Implant LoadingIschemic Attack, TransientUltrasonography, DopplerPopliteal ArteryCerebrospinal Fluid Rhinorrhea