| 摘要 |
PURPOSE:To accurately and easily execute magnetic field correction by moving a magnetic substance piece along a rail or a cylindrical body and adjusting the position of the piece. CONSTITUTION:In the inner surface of a cylinder 5 of a nonmagnetic substance, plural linear rails 6 and ring rails 7, which are coaxial with the cylinder 5, are respectively fit in parallel with the central shaft of the cylinder 5. Here, the rails 6 and 7 and cylinder 5 are fixed by welding, etc. This cylinder 5, on which the rails 6 and 7 are arranged, is fit to the normal temperature bore of a superconductive magnet for MRI. a steel piece 1, whose cross section is rectangular, is fit to the rail 6, slided up to a prescribed position and fixed by a tape or adhesive, etc. |
