Central Nervous System Vascular MalformationsAngiographySpinal CordCerebral AngiographyCoronary AngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionSpinal Cord InjuriesCerebral ArteriesCerebral InfarctionTomography, X-Ray ComputedFluorescein AngiographyCerebrovascular CirculationCerebral PalsySensitivity and SpecificityMiddle Cerebral ArteryCerebral VeinsIntracranial AneurysmInjections, SpinalBrainContrast MediaSpinal Cord DiseasesMagnetic Resonance ImagingSpinal NervesInfarction, Middle Cerebral ArteryBrain IschemiaAnesthesia, SpinalSpinal Cord NeoplasmsSpinal Nerve RootsMalaria, CerebralCerebral HemorrhagePredictive Value of TestsSpinal CanalSpinal DiseasesSpinal Cord CompressionSubarachnoid HemorrhageReproducibility of ResultsSpinal NeoplasmsRadionuclide AngiographyImaging, Three-DimensionalProspective StudiesTime FactorsRetrospective StudiesIntracranial Arteriovenous MalformationsTreatment OutcomeCoronary Artery DiseaseEmbolization, TherapeuticSpinal StenosisTomography, Spiral ComputedSpinal FusionCoronary StenosisIschemic Attack, TransientImage Processing, Computer-AssistedDiagnostic ImagingDiagnostic ErrorsArterial Occlusive DiseasesBlood Flow VelocityAnterior Cerebral ArteryFollow-Up StudiesCerebrovascular DisordersAneurysm, RupturedPosterior Cerebral ArteryVertebral ArterySpinal InjuriesObserver VariationMuscular Atrophy, SpinalRats, Sprague-DawleySeverity of Illness IndexIopamidolDiagnostic Tests, RoutineCarotid StenosisMultidetector Computed TomographySpinal Cord IschemiaDisease Models, AnimalBasilar ArteryCircle of WillisCarotid Artery, InternalTomography, Emission-Computed, Single-PhotonVasospasm, IntracranialRadiographic Image Interpretation, Computer-AssistedStentsIntracranial Embolism and ThrombosisIohexolGanglia, SpinalCoronary VesselsConstriction, PathologicDiagnostic Techniques and ProceduresCerebral RevascularizationCoronary DiseaseRadiographic Image EnhancementROC CurveArteriovenous FistulaSpineParaplegiaImage EnhancementRisk FactorsVertebrobasilar InsufficiencyArteriovenous MalformationsMotor NeuronsThoracic Vertebrae