AngiographyCerebral AngiographyTomography, X-Ray ComputedAngiography, Digital SubtractionCoronary AngiographyMagnetic Resonance AngiographyTomography, Spiral ComputedRadiographic Image Interpretation, Computer-AssistedIntracranial AneurysmMultidetector Computed TomographyIohexolContrast MediaSensitivity and SpecificityImaging, Three-DimensionalRadiographic Image EnhancementIopamidolImage Processing, Computer-AssistedRadiation DosageFluorescein AngiographyReproducibility of ResultsCoronary StenosisPredictive Value of TestsVertebrobasilar InsufficiencyCoronary Artery DiseaseCarotid Artery, InternalIntracranial Arteriovenous MalformationsObserver VariationCarotid StenosisSubarachnoid HemorrhageVertebral ArteryCardiac-Gated Imaging TechniquesRetrospective StudiesPerfusion ImagingEmbolization, TherapeuticAneurysm, RupturedProspective StudiesCerebral VeinsCerebral ArteriesCircle of WillisCeliac ArteryMyocardial Perfusion ImagingExtravasation of Diagnostic and Therapeutic MaterialsBasilar ArteryRadionuclide AngiographyPlaque, AtheroscleroticCentral Nervous System Vascular MalformationsAortographySubtraction TechniquePhantoms, ImagingTriiodobenzoic AcidsArtifactsArterial Occlusive DiseasesSeverity of Illness IndexTreatment OutcomeStentsImage EnhancementFeasibility StudiesIntracranial ArteriosclerosisCarotid Artery DiseasesCerebral HemorrhageVasospasm, IntracranialCoronary VesselsAneurysm, FalseCalcinosisVertebral Artery DissectionMagnetic Resonance ImagingTomography, Emission-Computed, Single-PhotonVascular CalcificationCarotid ArteriesFollow-Up StudiesConstriction, PathologicCerebral Arterial DiseasesStrokePulmonary EmbolismOral HemorrhageInjections, Intra-ArterialBrain IschemiaBody BurdenCollateral CirculationPhlebographyCerebrovascular DisordersVascular MalformationsRadiology, InterventionalTakayasu ArteritisAcute DiseasePreoperative CareTime FactorsEpigastric ArteriesRenal ArteryFour-Dimensional Computed TomographyElectrocardiographyHematomaRadiation ProtectionImage Interpretation, Computer-AssistedRenal VeinsIncidental FindingsHepatic ArteryMesenteric Artery, SuperiorCone-Beam Computed TomographyPrognosis