Gradient magnetic field coil and magnetic resonance imaging appa

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material

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335296, H01F 500

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active

061541109

ABSTRACT:
A gradient magnetic field coil for use in a magnetic resonance imaging apparatus having a magnet for generating a homogeneous magnetic field area by a magnetic field from a magnetic field generation source accommodated in a cooling container and generating a static magnetic field in a predetermined direction includes a substantially flat coil group so extending as to orthogonally cross the direction of the magnetic field of the homogeneous magnetic field area, and the coil group includes a main coil for primarily generating a gradient magnetic field in the homogeneous magnetic field and a shield coil disposed between the main coil and the cooling container, for generating a magnetic field which substantially cancels the magnetic field generated at outside portions of the main coil close to the cooling container to zero. A gradient magnetic coil for use in a magnetic resonance imaging apparatus has a coil group including a main coil for primarily generating a gradient magnetic field and a shield coil disposed between the main coil and the cooling container, two sets of the cooling containers are so disposed as to oppose each other in the direction of the homogeneous magnetic field, and the coil group is provided to each of the two sets of cooling containers.

REFERENCES:
patent: 4794338 (1988-12-01), Roemer et al.
patent: 5132618 (1992-07-01), Sugimoto
patent: 5448214 (1995-09-01), Laskaris
patent: 5581187 (1996-12-01), Pausch

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