ANALYSIS OF FREQUENCY MAGNETIC-FIELD PENETRATION IN A BODY WITHIN MAGNETIC-RESONANCE-IMAGING ANTENNA

The authors have previously developed a computer code for obtaining th e current distribution on the magnetic resonance imaging (MRI) antenna loaded by a male model with an arbitrary geometry and material proper ties by incorporating the impedance method into the method of Richmond . Using this method, RF magnetic field penetration in a biological bod y within an MRI antenna is discussed theoretically. It is found that t he RF magnetic field produced by the current in the body does not canc el the incident RF magnetic field produced by the current on the MRI a ntenna, since the phase difference between these magnetic fields devia tes from 180 degrees.