Magnetic Resonance ImagingEcho-Planar ImagingContrast MediaDiffusion Magnetic Resonance ImagingImage EnhancementImage Processing, Computer-AssistedGadolinium DTPABrainImage Interpretation, Computer-AssistedMagnetic Resonance AngiographySensitivity and SpecificityImaging, Three-DimensionalReproducibility of ResultsCerebrovascular CirculationMagnetic Resonance SpectroscopyAlgorithmsBrain MappingTime FactorsGadoliniumTomography, X-Ray ComputedAtrophyMagnetite NanoparticlesMagnetic Resonance Imaging, InterventionalFerrosoferric OxideWhole Body ImagingPhantoms, ImagingPositron-Emission TomographyArtifactsMagnetic Resonance Imaging, CineBrain Diseases