Cerebrovascular CirculationRegional Blood FlowBrainBlood Flow VelocityOxygenTomography, Emission-ComputedOxygen RadioisotopesMagnetic Resonance ImagingMiddle Cerebral ArteryBlood-Brain BarrierBrain ChemistryBrain MappingUltrasonography, Doppler, TranscranialCarbon DioxideAtrophyBrain InjuriesImage Processing, Computer-AssistedBlood PressureDimethadioneCerebral CortexOrgan SizeBrain NeoplasmsPositron-Emission TomographyLaser-Doppler FlowmetryGyrus CinguliBrain IschemiaCaudate NucleusFlow CytometryTime FactorsNeuropsychological TestsFluorodeoxyglucose F18Frontal LobeImage Interpretation, Computer-AssistedBiogenic MonoaminesRats, Sprague-DawleyVascular ResistanceCarbon RadioisotopesRadiopharmaceuticalsTissue DistributionPulsatile FlowFunctional LateralityAgingAutoradiographyTechnetium Tc 99m ExametazimeXenon RadioisotopesThalamusBrain EdemaDeoxyglucoseAnalysis of VarianceGlucoseCerebellumReference ValuesPrefrontal CortexTomography, Emission-Computed, Single-PhotonHemodynamicsMicrospheresFluorine RadioisotopesFenfluramineNeuroimagingCognitionDogsDisease Models, AnimalAlzheimer DiseaseTemporal LobeMicrocirculationBrain StemPutamenCognition DisordersReproducibility of ResultsBehavior, AnimalNeural PathwaysLimbic SystemOxygen ConsumptionRats, WistarOccipital LobeRenal CirculationRats, Inbred StrainsVasodilationHippocampusLiver CirculationNerve NetPulmonary CirculationSchizophreniaParietal LobeRheologySplanchnic CirculationMemoryHyperemiaDose-Response Relationship, DrugCase-Control StudiesHeart RateNerve Fibers, MyelinatedImaging, Three-DimensionalUltrasonography, DopplerXenonBlood VolumeDopamineHypoxia, BrainDiffusion Tensor ImagingBrain Abscess