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US 12,693,358 B2Granted
MRI apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTakehiro Shibuya, Hiromi Kawamoto, Sadanori Tomiha, Misaki Hattaha
Life of this patent
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Abstract
In one embodiment, an MRI apparatus includes: a static magnet provided with a superconducting coil and configured to generate a static magnetic field having static magnetic field distribution in an open space outside the superconducting coil; control circuitry configured to adjust the static magnetic field distribution; and a reconstruction processing circuit configured to generate a magnetic resonance image on the basis of magnetic resonance signals emitted from an object that is at least partially placed in the open space outside the superconducting coil.
Claims13
An MRI apparatus, comprising:
- a static magnet provided with a superconducting coil and configured to generate a static magnetic field having static magnetic field distribution in an open space outside the superconducting coil, the superconducting coil being divided into a plurality of segments, each segment having a superconducting subcoil that is electrically independent of other of the plurality of segments, the plurality of the segments in the superconducting coil being divided into a first group and a second group;
- control circuitry configured to adjust the static magnetic field distribution, by having a direction of a first electric current applied to the segments in the first group opposite to a direction of a second electric current applied to the segments in the second group, and by independently controlling a magnitude of the first electric current and a magnitude of the second electric current, so as to adjust at least one of a position of an imaging region of an object and a range of the imaging region of the object;
- and
- a reconstruction processing circuit configured to generate a magnetic resonance image based on magnetic resonance signals emitted from the object that is at least partially placed in the open space outside the superconducting coil.
1 more element
An MRI apparatus, comprising:
- a static magnet provided with a superconducting coil and configured to generate a static magnetic field having static magnetic field distribution in an open space outside the superconducting coil, the superconducting coil being divided into a plurality of segments, each segment having a superconducting subcoil that is electrically independent of other of the plurality of segments, the plurality of the segments in the superconducting coil being divided into a first group and a second group;
- a magnet power supply configured to apply an electric current to the superconducting coil;
- control circuitry configured to adjust the static magnetic field distribution by independently controlling the electric current applied to the superconducting coil for each segment so as to adjust at least one of a position of an imaging region of an object and a range of the imaging region of the object:
- wherein the control circuitry is further configured to
- control the static magnetic field distribution relating to the segments in the first group by having a persistent current mode in which an electric current applied to the first superconducting coil is increased to a predetermined value and then the electric current continues to flow in the segments in the first group in a state of being disconnected from the magnet power supply;
- and
- control the static magnetic field distribution relating to the segments in the second group by adjusting an electric current applied to the segments in the second group under a state where the magnet power supply is connected to the segments in the second group;
- and
- a reconstruction processing circuit configured to generate a magnetic resonance image based on magnetic resonance signals emitted from the object that is at least partially placed in the open space outside the superconducting coil.
6 more elements
Dependencies are inferred from the claim text.