Tomography, X-Ray ComputedCerebral ArteriesTomographyPositron-Emission TomographyCerebral InfarctionTomography, Optical CoherenceTomography, Emission-ComputedCerebrovascular CirculationCerebral PalsyMiddle Cerebral ArteryTomography, Spiral ComputedBrainTomography, Emission-Computed, Single-PhotonTomography, OpticalCerebral AngiographyMultidetector Computed TomographyInfarction, Middle Cerebral ArteryMalaria, CerebralCerebral VeinsCone-Beam Computed TomographyElectron Microscope TomographyBrain IschemiaCerebral HemorrhageMagnetic Resonance ImagingTomography, X-RayFluorodeoxyglucose F18Tomography Scanners, X-Ray ComputedImaging, Three-DimensionalIschemic Attack, TransientImage Processing, Computer-AssistedAnterior Cerebral ArterySubarachnoid HemorrhageCerebral VentriclesSensitivity and SpecificityPosterior Cerebral ArteryBrain DiseasesCerebral Amyloid AngiopathyCerebrovascular DisordersBrain EdemaBlood Flow VelocityTime FactorsReproducibility of ResultsIntracranial Embolism and ThrombosisIntracranial AneurysmDominance, CerebralFluorine RadioisotopesTreatment OutcomePredictive Value of TestsIntracranial PressureOxygen RadioisotopesCerebral RevascularizationRetrospective StudiesProspective StudiesXenon RadioisotopesVasospasm, IntracranialCerebrumX-Ray MicrotomographyDisease Models, AnimalContrast MediaRadiographic Image Interpretation, Computer-AssistedMultimodal ImagingTechnetium Tc 99m ExametazimeMagnetic Resonance AngiographyPhantoms, ImagingRegional Blood FlowStrokeSpectroscopy, Near-InfraredOxygenDiagnostic ImagingRats, Sprague-DawleyOrganotechnetium CompoundsCarbon DioxideOximesHypoxia, BrainBlood-Brain BarrierCarbon RadioisotopesFollow-Up StudiesNeuroprotective AgentsBlood VolumeBasilar ArteryReperfusionIofetamineFour-Dimensional Computed TomographyBlood PressureAcetazolamideXenonPia MaterImage EnhancementArterial Occlusive DiseasesBrain InfarctionCalcinosisRadiographic Image EnhancementIntracranial Arteriovenous MalformationsAneurysm, RupturedIntracranial ThrombosisBrain ChemistryAlgorithmsNeurologic ExaminationElectroencephalographyNeurons