Cerebral AngiographyAngiographyMagnetic Resonance AngiographyCoronary AngiographyAngiography, Digital SubtractionIntracranial AneurysmCerebral ArteriesTomography, X-Ray ComputedIntracranial Arteriovenous MalformationsSubarachnoid HemorrhageCerebral InfarctionFluorescein AngiographyCarotid Artery, InternalCerebral VeinsVertebral ArteryCerebrovascular CirculationCranial SinusesMoyamoya DiseaseCentral Nervous System Vascular MalformationsAneurysm, RupturedCircle of WillisPosterior Cerebral ArteryContrast MediaCerebral HemorrhageCerebrovascular DisordersIschemic Attack, TransientEmbolization, TherapeuticMiddle Cerebral ArteryArterial Occlusive DiseasesBrain IschemiaMagnetic Resonance ImagingBasilar ArteryVasospasm, IntracranialCerebral Arterial DiseasesCerebral RevascularizationIntracranial Embolism and ThrombosisCarotid StenosisCarotid Artery DiseasesSensitivity and SpecificityVertebrobasilar InsufficiencyAnterior Cerebral ArteryRadionuclide AngiographyArteriovenous FistulaVasculitis, Central Nervous SystemIntracranial ArteriosclerosisCollateral CirculationArteriovenous MalformationsBrainCerebral PalsyProspective StudiesSinus Thrombosis, IntracranialBlood Flow VelocityCarotid ArteriesConstriction, PathologicImaging, Three-DimensionalCoronary Artery DiseaseTreatment OutcomeEndarterectomyCoronary StenosisTomography, Spiral ComputedCraniotomyRetrospective StudiesNeurosurgical ProceduresBlindness, CorticalEpilepsy, Tonic-ClonicFollow-Up StudiesIntracranial EmbolismNeurologic ExaminationCavernous SinusCarotid-Cavernous Sinus FistulaHematoma, SubduralPredictive Value of TestsVertebral Artery DissectionInfarction, Middle Cerebral ArterySurgical InstrumentsCranial Fossa, AnteriorTime FactorsIopamidolTemporal ArteriesHematomaImage Processing, Computer-AssistedMultidetector Computed TomographyCatheterizationUltrasonography, Doppler, TranscranialRadial ArteryRupture, SpontaneousHematoma, Subdural, IntracranialHeadacheCoronary VesselsStentsLateral Medullary SyndromeComaReproducibility of ResultsIntracranial HemorrhagesMalaria, CerebralIohexolUltrasonographyCoronary DiseaseDura MaterRadiographic Image Interpretation, Computer-Assisted