Patent ID: 6570475
Filing Date: 2003-05-27
Classification: G01R

Abstract:
A split type superconducting magnet assembly, in particular for MRI imaging, comprising:an enclosure comprising a pole surface, a side wall extending from said pole surface and an outer end surface connected to said side wall; a superconducting main coil disposed in said enclosure adjacent said pole surface, said main coil having an inner diameter and an outer diameter; a primary shield coil disposed in said enclosure between said main coil and said outer end surface, said primary shield coil having an outer diameter larger than said outer diameter of said main coil and carrying current in a direction opposite to that of said main coil; and a plurality of field shaping coils disposed adjacent said pole surface, each of said field shaping coils having an outer diameter less than the inner diameter of said main coil and axially disposed coplanar with said main coil or between said main coil and said shield coil, each of said field shaping coils having a predetermined location and magnetic polarity.