The coils for the production of field gradients magnetic of polarization beams uniform in an installation for imaging or by nmr spectroscopy.

摘要

System of coils, for the production of imaging by resonance magnetic resonance of gradients g, g, placed on the outer surface of a right cylinder of revolution with axis oz and of radius r, characterizes in that it comprises four patterns of conductive wires symmetric two has two with respect to the center o and two has two with respect to the vertical plane xoy: - each pattern comprises three arcs participating in the figures of the gradient, namely two arcs of a "go" pressure of the center o situated at respective distances h and h of the plane xoy and an arc "return" more distant of the center o and situated at the distance h from the plane xoy; - each arc comprises three sections a, b, c, the two extreme a and c of the same length are traversed by a current of intensity half that which passes through the central section b, - in that the ratios hr, hr and hr are chosen as close as possible of the following values: / p & & p & hr: 0,15 has 0,3 and / p & & p & hr: 0,7 has 1,0 and / p & & p & hr: 1,5 has 2,5.