Spin LabelsElectron Spin Resonance SpectroscopyCerebrovascular CirculationPerfusion ImagingMagnetic Resonance AngiographyBlood Circulation TimeMagnetic Resonance ImagingCerebral ArteriesCyclic N-OxidesImage EnhancementSpin TrappingImage Processing, Computer-AssistedImage Interpretation, Computer-AssistedArteriesBrainBlood Flow VelocityReproducibility of ResultsSignal-To-Noise RatioNitrogen OxidesBrain MappingRegional Blood FlowBlood Volume DeterminationEcho-Planar ImagingAlgorithmsArtifactsSensitivity and SpecificityOxygenPerfusionHypercapniaMembrane FluidityContrast MediaTriacetoneamine-N-OxylDimyristoylphosphatidylcholineStearic AcidsComputer SimulationMesylatesProtein ConformationLipid BilayersMembrane LipidsSubtraction TechniqueMoyamoya DiseaseBlood VolumeModels, MolecularPhosphatidylcholinesMembranes, ArtificialDiffusion Magnetic Resonance ImagingTemperatureCholestanesMicrowavesPulmonary CirculationFeasibility StudiesAffinity LabelsMaleimidesMolecular ConformationMagnetic Resonance SpectroscopyNanodiamondsCerebral CortexIodoacetamideModels, CardiovascularPhospholipidsAndrostanesBinding SitesBacteriophage T4MagnetometryPositron-Emission TomographyProtein Structure, SecondarySulfhydryl CompoundsPiperidonesBiophysical PhenomenaModels, ChemicalKineticsTime Factors