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US 5,296,812 AGranted
Superconducting magnet assembly for MRI and MRI diagnostic apparatus
AssigneeHitachi, Ltd.
InventorsMasashi Kitamura, Shigeru Kakugawa
Life of this patent
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Abstract
A superconducting means for MRI including seven to nine small superconducting coils situated in such a manner that the number of turns of these coils becomes progressively greater towards the outside, and preventing the occurrence of 2nd to 16th order inhomogeneous fields.
Claims8
A superconducting magnet assembly for MRI comprising:
- small superconducting coils disposed axially symmetrically with respect to a central axis and coaxially with said central axis;
- a non-magnetic bobbin having said small super-conducting coils wound thereon;
- a cryostat for storing said bobbin and said small superconducting coils;
- and
- a magnetic shield member fitted to the outside of said cryostat;
- wherein seven to nine of said small super-conducting coils are disposed so that the number of turns of said small superconducting coils becomes progressively greater towards the outside.
3 more elements
An MRI diagnostic apparatus comprising:
- a bed for supporting thereon a subject;
- a radio frequency (RF) coil for detecting signals of nuclear magnetic resonance, encompassing said subject;
- a gradient coil for generating a gradient field, disposed around the outer periphery of said RF coil;
- a superconducting magnet disposed around the outer periphery of said gradient coil;
- a power supply for energizing said super-conducting magnet, a shim coil and said gradient coil;
- and
- a controller for controlling said power supply;
- wherein seven to nine small superconducting coils constituting said superconducting magnet are disposed in such a manner that the number of turns of said superconducting coils becomes progressively greater towards the outside.
5 more elements
Dependencies are inferred from the claim text.