Gradient coil for nuclear magnetic resonance image forming apparatus

Claim 1

A gradient coil for nuclear magnetic resonance image forming apparatus of the type having conductors each formed about the cylinder along a so-called saddle contour, these conductors being gathered together in four identical arrangements symmetrical with respect to the center of a predetermined examination space, wherein the conductors are flat, their section being in the form of an elongated rectangle, the small dimension of the rectangle being oriented radially to the cylinder, the ratio of the larger dimension to the small dimension being not less than 2.5, and wherein the four arrangements each include eight conductors, the eight conductors being defined in each arrangement by their angular opening parameters and by the axial position of the hoop parts of the saddle which they form, these parameters being respectively equal, within plus or minus 10%, to: ______________________________________ for the first conductor 150°00' 0.291 R 1.332 R for the second conductor 137°18' 0.250 R 1.291 R for the third conductor 132°42' 0.291 R 1.250 R for the fourth conductor 105°00' 0.332 R 1.209 R for the fifth conductor 145°24' 0.790 R 1.621 R for the sixth conductor 137°18' 0.831 R 1.580 R for the seventh conductor 132°42' 0.872 R 1.415 R for the eighth conductor 105°00' 0.914 R 1.374 R ______________________________________ where R is the radius of the cylinder which carries them.