title: Some contrast agents in oil well logging and in medical MRI.
abstract: Magnetite particles and paramagnetic ion chelates are used as contrast agents in both nuclear magnetism logging of oil wells and in medical MRI. An analytic expression for reduction of T2 for free precession signal decay (or gradient echoes) by magnetite particles does not depend on diffusion and agrees with published Monte Carlo computations.
authors: R J
authors: RJ
authors: Brown
mesh_terms: D003287:Contrast Media; D052203:Ferrosoferric Oxide; D006801:Humans; D007501:Iron; D008279:Magnetic Resonance Imaging; D009010:Monte Carlo Method; D010087:Oxides; D010578:Petroleum
chemical_list: D003287:Contrast Media; D010087:Oxides; D010578:Petroleum; D007501:Iron; D052203:Ferrosoferric Oxide