Flared gradient coil set with a finite shield current

Details Flared gradient coil set with a finite shield current Flared gradient coil set with a finite shield current

1998-01-05

2000-06-20

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, 600410, 600422, 335301, G01V 300

Patent

active

060781777

ABSTRACT:
A method of designing a shielded gradient coil assemblies (22) with a flared primary coil (60) for magnetic resonance imaging systems is provided. The method includes generating a first continuous current distribution for a primary coil (60) using an inverse approach. The first continuous current distribution is confined within predetermined finite geometric boundaries of a surface defined by three dimensions and generates a magnetic gradient field across an imaging region (14). The magnetic gradient field is constrained to predetermined values at specified spatial locations within the imaging region (14). The current distribution and magnetic field are converted into a stored energy and magnetic field domain where a finite element analysis is performed to generate a second continuous current distribution for a shielding coil (62). The second continuous current distribution is confined within predetermined finite geometric boundaries of a surface surrounding the primary coil (60). The second continuous current distribution generates a magnetic field which substantially cancels in an area outside a region defined by the shielding coil a fringe magnetic field generated by the first continuous current density.

REFERENCES:
patent: 5378989 (1995-01-01), Barber et al.
patent: 5485087 (1996-01-01), Morich et al.
patent: 5497089 (1996-03-01), Lampman et al.
"Design Criteria for a Folded Gradient Coil," Apr. 1997, Schenck, et al.

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