| 摘要 |
<p>The present invention aims to implement a pair of gradient coils (204,206,208) low in magnetizing force with respect to pole pieces. Upon manufacturing a pair of gradient coils each of which produces gradient magnetic fields by currents that flow through a plurality of concentric passes, the maximum radius (r1,r2... .. rm) of one of current passes for the gradient coil is set as the minimum value at which a gradient magnetic field having a magnetic field error within a predetermined allowable range can be produced. <IMAGE></p> |
