MRI magnet assembly with non-conductive inner wall

摘要

An MR magnet assembly (10) includes a cylindrical vessel for housing a superconducting magnet and having a vacuum between its inner and outer walls (14,13). The vessel defines a magnet bore (36) for receiving a patient to be imaged. A gradient coil assembly (66) is mounted in the bore adjacent the inner wall (14) of the magnet assembly. To reduce gradient coil noise, the inner wall is constructed of a nonconductive material which does not support eddy currents.