Patent ID: 7839147

Claim:
An imaging apparatus comprising: a radio frequency coil system for generating radio frequency excitation pulses in an examination region, radio frequency coil system including N coil elements which generate magnetic and electric fields, where N is a plural number; a weight setting device which sets weight factors for input signals for the coil elements; a transmitting system, which creates RF pulses, at least two sets of each with differently weighted input signals, and transmits the at least two sets of RF pulses to the coil elements such that each of the transmitted RF pulse sets generates shifted electric fields having a shifted zero crossing point from each other; and an image processor which computes electric permittivity (ε) maps from resonance induced by the at least two sets of RF pulses with different weighting, the image processor including: a memory arrangement which holds the ε maps generated with the RF pulse sets; an algorithm or processor which combines the ε maps from the at least two RF pulse sets to generate a corrected ε map corrected for regions in which the electric fields is near zero in one of the ε maps.