Double type coil for generating slant magnetic field for MRI

A slant magnetic field coil apparatus where four sets of double type coils each in substantially semi-circular cylinder shape are arranged in symmetry having the axis of the cylinders in common, each double type coil comprising:

• a first coil with a current path formed on a substantially semi-circular cylinder surface, said current path being constituted by a path in spiral shape and a plurality of paths in horseshoe shape surrounding the outside of the spiral path, one end of the spiral path and both ends of the plural horseshoe-shaped paths being aligned at one end of the semi-cylinder;
• a second coil with a current path formed on a semi-cylinder surface formed coaxial to the outside of the first coil, said current path being constituted by a path in spiral shape wound in opposite direction to the spiral of the current path of said first coil and a plurality of paths in horseshoe shape surrounding the outside of the spiral path, one end of the spiral path and both ends of the plural horseshoe-shaped paths being aligned at one end of the semi-cylinder;
• and
• connection means for connecting all current paths in series over the first coil and the second coil and for forming one current path,
• wherein the first coil and the second coil are combined in aligning in opposite end to the side in which both ends of the plural horseshoe-shaped paths are aligned.