Abstract: A pole piece for use in an open magnet includes a magnetizable body of generally cylindrical shape and made of a ferromagnetic material with a plurality of concentrically-arranged, annular-shaped, radially spaced-apart grooves formed in the inner surface of the pole piece. A plurality of annular-shaped, electrically conductive coils are disposed within the grooves. The pole piece with recessed shielding coils is situated within a cryogenic vessel to maintain the pole pieces at a uniform cryogenic temperature. The result is an open magnet structure which provides a highly uniform, high field, open field of view for MRI with a well-contained stray field.
Type:
Grant
Filed:
September 10, 2001
Date of Patent:
January 7, 2003
Assignee:
General Electric Company
Inventors:
Xianrui Huang, Michael Anthony Palmo, Jr., Evangelos Trifon Laskaris, Bruce Campbell Amm