Collateral CirculationCircle of WillisCoronary CirculationCerebrovascular CirculationCerebral ArteriesCerebral AngiographyMagnetic Resonance AngiographyCollateral LigamentsArterial Occlusive DiseasesCarotid Artery, InternalKidney CalicesDoppler EffectCoronary AngiographyMoyamoya DiseaseAngiographyCoronary OcclusionBlood Flow VelocityLiver CirculationAngiography, Digital SubtractionHypertension, PortalRegional Blood FlowMedial Collateral Ligament, KneeAngina PectorisCarotid Artery, ExternalIschemiaLigationConstriction, PathologicBalloon OcclusionCarotid StenosisCoronary VesselsCoronary DiseaseCineangiographyCeliac ArteryBrain IschemiaBlood CirculationAngioplasty, Balloon, CoronaryTomography, X-Ray ComputedCerebral Arterial DiseasesCoronary StenosisDNA, CircularCerebral InfarctionHindlimbFemoral ArteryHemodynamicsManagement Quality CirclesMyocardial InfarctionNeovascularization, PhysiologicMyocardial IschemiaElectrocardiographyInfarction, Middle Cerebral ArteryPhlebographyNeuroendoscopyCardiac CatheterizationTime FactorsCarotid Artery DiseasesCarotid ArteriesUltrasonography, Doppler, TranscranialBrainDogsBasilar ArteryEmbolization, TherapeuticStrokeIntracranial ArteriosclerosisVertebral ArteryArteriesExtracorporeal CirculationPulmonary CirculationTreatment OutcomeProspective StudiesIntracranial AneurysmHistory, 17th CenturyBlood PressureCoronary Artery DiseaseDisease Models, AnimalArachnoidFollow-Up StudiesOphthalmic ArteryMagnetic Resonance ImagingSphenoid BonePia MaterEchoencephalographyRetrospective Studies