Static Magnetic Field Adjustment Device for Magnetic Resonance Imaging Apparatus and Superconducting Magnet

A static magnetic field adjustment device for a magnetic resonance imaging apparatus, for adjusting a static magnetic field in an imaging region of the magnetic resonance imaging apparatus, the static magnetic field adjustment device comprising:

• a shim tray mounted on the magnetic resonance imaging apparatus and provided with a recess;
• a bottom spacer made of a non-magnetic material and accommodated in the recess to make contact with a bottom surface of the recess;
• a magnetic material shim made of a magnetic material and accommodated in the recess with the bottom spacer interposed between the magnetic material shim and the bottom surface;
• and
• a top spacer accommodated in the recess with the bottom spacer and the magnetic material shim interposed between the top spacer and the bottom surface,
• the recess being filled with the magnetic material shim, the bottom spacer and the top spacer, and
• the bottom spacer including a first bottom spacer and a second bottom spacer, a material of the first bottom spacer being different from a material of the second bottom spacer.