Iron CompoundsVibrationMetalloporphyrinsMagnetic Resonance SpectroscopyIronSpectrum AnalysisMagnetic Resonance ImagingModels, MolecularSurface Plasmon ResonanceElectron Spin Resonance SpectroscopyMagnetic Resonance AngiographyFluorescence Resonance Energy TransferMagnetic Resonance Imaging, CineNuclear Magnetic Resonance, BiomolecularContrast MediaDiffusion Magnetic Resonance ImagingBrainGadolinium DTPASpectrum Analysis, RamanGadoliniumBrain MappingSpin LabelsImage Interpretation, Computer-AssistedImage EnhancementImaging, Three-DimensionalProtonsMagnetic Resonance Imaging, InterventionalReproducibility of ResultsSensitivity and SpecificityOxygenProtein ConformationTomography, X-Ray ComputedEnergy TransferCholangiopancreatography, Magnetic ResonanceProtein BindingTime FactorsCreatinePredictive Value of Tests