Perturbation of the current density in a magnetic resonance imaging antenna induced by the presence of a patient

The separate modellings of the surface current distribution in a MRI antenna (with nothing around), and of the volume eddy current appearing in a patient placed in a given magnetic field, have already been described (Ouldkhal et al., 1995; Bossavit and Verite, 1983; Bandelier and Rioux-Damidau, 1990). When the patient is put in the magnetic field of an antenna, there appear mutual reactions. The authors here present an iterative method which allows them to compute in this last case the current density in both antenna and body, even when they are very close to each other