Passive Shimming of MRI Magnets with B0 >= 3T at Reduced Field

Yuri Lvovsky¹, Zhenyu Zhang¹, Timothy Hollis², Ye Bai²

Method of passive shimming of MRI magnet is presented. To reduce forces and torque during shim tray insertion / removal, after the initial virgin map is taken at full field the magnet is partially ramped down where coarse iterations are performed using maps acquired at lower field. Test results proved successful shimming of the magnet.