Patent ID: 6049207
Filing Date: 2000-04-11
Classification: G01R

Abstract:
A method of designing a shielded gradient coil assembly for magnetic resonance imaging systems comprising:(a) generating a first continuous current distribution for a first primary coil set such that the first continuous current distribution is confined within predetermined finite geometric boundaries of a first surface defined by two dimensions and generates a first magnetic gradient field across an imaging region, the first magnetic gradient field constrained to predetermined values at specified spatial locations within the imaging region;(b) generating a second continuous current distribution for a second primary coil set such that the second continuous current distribution is confined within predetermined finite geometric boundaries of a second surface defined by two dimensions and generates a second magnetic gradient field across an imaging region, the second magnetic gradient field constrained to predetermined values at specified spatial locations within the imaging region; and(c) generating a third continuous current distribution for a shielding coil set such that the third continuous current distribution is confined within predetermined finite geometric boundaries of a surface surrounding the primary coil set and second primary coil set, such that the third continuous current distribution generates a magnetic field which substantially cancels in an area outside a region defined by the shielding coil set a first fringe magnetic field generated by the first continuous current distribution and a second fringe magnetic field generated by the second continuous current distribution.