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US 5,489,848 AGranted
Magnetic resonance imaging apparatus
AssigneeKabushiki Kaisha Toshiba
InventorHiroshi Furukawa
Life of this patent
Estimating the term…
Abstract
In a magnetic resonance imaging apparatus a superconductive magnet is disposed in a first vacuum vessel defined by an outer cylinder and an inner cylinder. Another cylinder is coaxially disposed in the inner cylinder of the first vacuum vessel to form a second vacuum vessel. A gradient coil is disposed in the second vacuum vessel to prevent the noise from transmitting outside the second vacuum vessel.
Claims19
A magnetic resonance imaging apparatus comprising:
- magnet means for producing a static magnetic field, having a magnet disposed between an outer cylinder and a first inner cylinder;
- vacuum vessel means for forming a vacuum space having a second inner cylinder coaxially disposed in said first cylinder defining the vacuum space between said first and second cylinder;
- gradient means for producing a gradient magnetic field, having a gradient coil disposed in said vacuum space wherein the gradient coil is separated from said first and second cylinders by the vacuum space.;
- and
- radio-frequency means for transmitting a radio-frequency pulse and for receiving a magnetic resonance signal induced from an object.
2 more elements
A magnetic resonance imaging apparatus comprising:
- a magnet system for producing a static magnetic field, having a superconductive magnet disposed between an outer cylinder and a first inner cylinder;
- a gradient system for producing a gradient magnetic field, including a second inner cylinder coaxially disposed in said first cylinder for forming a vacuum space between said first and second cylinder, a pair of end plates for closing the vacuum space disposed at the ends of said first and second inner cylinder, a gradient coil disposed in said vacuum space wherein the gradient coil is separated from said first and second cylinders by the vacuum space, and a pair of supporting members for adjustably supporting said gradient coil at end portions of said first inner cylinder, said second inner cylinder and said end plates being detachably disposed;
- and
- a radio-frequency coil system for transmitting a radio-frequency pulse and for receiving a magnetic resonance signal induced from an object.
1 more element
A magnetic resonance imaging apparatus comprising:
- magnet means for producing a static magnetic field, having a bore at the center thereof;
- gradient means for producing a gradient magnetic field, having a cylinder coaxially disposed in said bore for forming a vacuum space between said magnet means and said cylinder, and having a gradient coil disposed in said vacuum space wherein the gradient coil is separated from said first and second cylinders by the vacuum space;
- and
- radio-frequency means for transmitting a radio-frequency pulse and for receiving a magnetic resonance signal induced from an object.
1 more element
Dependencies are inferred from the claim text.