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US 5,633,587 AGranted
Magnetostatic field generating magnet for use in an MRI system having an active magnetic shield
AssigneeKabushiki Kaisha Toshiba
InventorTamiko Hirumachi
Life of this patent
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Abstract
A magnetostatic field generating magnet includes small-diameter coils for generating a low-order magnetic component, a large-diameter coil for generating a high-order magnetic component, a first coil assembly for generating in a predetermined area a main magnetic field obtained by both the low- and high-order magnetic components, and a second coil assembly for generating a shield magnetic field for actively shielding a magnetic field leaking from the main magnetic field.
Claims13
A magnetic field generating magnet comprising:
- a first coil assembly having small-diameter coils and a large-diameter coil, for generating a main magnetic field in a predetermined area;
- and
- a second coil assembly for generating a shield magnetic field for actively shielding a magnetic field leaking from the main magnetic field,
- wherein each of the small-diameter coils and large-diameter coil of said first coil assembly is connected to said second coil assembly such that a direction of a current flow through the large-diameter coil of said first coil assembly is opposite to a direction of current flow through said second coil assembly, and the large-diameter coil of said first coil assembly is arranged near to or outside said second coil assembly.
1 more element
An MRI system comprising:
- a container having a subject insertion space;
- a first coil assembly contained in said container, together with a cooling medium, and having small-diameter coils and a large-diameter coil, for generating a main magnetic field in a predetermined area;
- a second coil assembly container in said container together with the cooling medium, for generating a shield magnetic field for actively shielding a magnetic field leaking from the main magnetic field;
- a gradient magnetic field generating section arranged in the subject insertion space of said container;
- an RF unit arranged in the subject insertion space of said container;
- and
- an electric unit for controlling said gradient magnetic field generating section and said RF unit and generating magnetic resonance information in response to a magnetic resonance signal from RF unit,
- wherein each of the small-diameter coils and large-diameter coil of said first coil assembly is connected to said second coil assembly such that a direction of current flow through the large-diameter coil of said first coil assembly is opposite to a direction of current flow through said second coil assembly, and the large-diameter coil of said first coil assembly is arranged near to or outside said second coil assembly.
5 more elements
Dependencies are inferred from the claim text.