Ricardo Hernandez1,
  Miguel Mendez-Rojas2, Eric Gutierrez3, Silvia Hidalgo
  Tobn4
 1Science
  Faculty, UNAM, DF, Mexico; 2Nanotechnology, UDLAP, Puebla, Mexico;
  3Medical Physics, UAEM, Toluca, Mexico, Mexico; 4Imagenology,
  Children Hospital Federico Gomez, Mexico, Mexico
Introduction: we studied the susceptibility effects of iron oxide (SPIONs) functionalized with triethylenglycol (TREG) and Polyethylen Glycol (PEG), those nanoparticles have the necessary properties to be used in the clinic as contrast media in imaging by MRI. We are considering the behavior of the magnetic field as plane wave to explain the electrical and magnetic field produced by SPIONs.