The conversation device of an MR imaging apparatus including a magnet for generating a static magnetic field, a gradient field coil disposed between pole pieces of the magnet and used for endowing an NMR signal with positional information, a high-frequency coil disposed in the gradient field coil for...http://www.google.fr/patents/US4903703?utm_source=gb-gplus-shareBrevet US4903703 - Conversation device of MR imaging apparatus