Magnetite NanoparticlesFerrosoferric OxideDextransFerric CompoundsOxidesContrast MediaMagneticsMagnetic Resonance ImagingParticle SizeNanoparticlesIronCell TrackingMicroscopy, Electron, TransmissionFerrocyanidesPrussian Blue ReactionMetal NanoparticlesMagnetsMagnetic FieldsMagnetospirillumMagnetosomesStaining and LabelingMicroscopy, Electron, Scanning TransmissionNanocapsulesPolylysineMacrophagesNanomedicineNanotechnologyNanostructuresDrug Delivery SystemsDrug CarriersSilanesGoldPhantoms, ImagingPolyethylene GlycolsImage EnhancementCoated Materials, BiocompatibleChitosanIron Chelating Agents