WINDING DEVICE WHICH GENERATE ADDITIONAL FIELD IN MAGNET WITH POLARIZED POLE PIECE FOR FORMING IMAGE BY NUCLEAR MAGNETIC RESONANCE AND OBTAIN POLARIZED FIELD HAVING FIXED GRADIENT

摘要

System of coils for producing additional fields in a magnet having pole pieces for producing images by nuclear magnetic resonance. For producing gradients Gx=( DIFFERENTIAL Bz/ DIFFERENTIAL x) and Gy=( DIFFERENTIAL Bz/ DIFFERENTIAL y), it comprises two layers of orthogonal windings, one on each pole piece. For producing the gradient Gz=( DIFFERENTIAL Bz/ DIFFERENTIAL z), it has two systems of windings of circular symmetry and axis Oz, located on the inner facing faces of the pole pieces and traversed by currents whose direction changes between the individual pole pieces.