Nuclear magnetic resonance imaging device
First Claim
Patent Images
1. A nuclear magnetic resonance imaging device, comprising:
- a magnetic structure defining an imaging cavity for housing at least part of a body of a patient, the magnetic structure providing a magnetic field for permeating at least part of the imaging cavity during imaging, the magnetic structure comprising an opening for the imaging cavity, said opening providing access to the imaging cavity from outside of the magnetic structure;
shielding means for at least partially closing said opening of the imaging cavity, the shielding means comprising electrically conductive material and being electrically grounded, the shielding means being secured to the magnetic structure substantially adjacent said opening;
guiding means for guiding the shielding means, the shielding means being movable along the guiding means from an inactive configuration in which the opening is substantially open to an active configuration in which the shielding means at least partially closes the opening;
wherein the shielding means comprises an electrically conductive frame provided substantially adjacent the opening for the imaging cavity, the shielding means further comprising a shielding member, said guiding means further comprising a guide provided in said electrically conductive frame, said shielding member being slidably mounted in said guide, the guide being electrically conductive and the shielding member electrically conductive and electrically grounded.
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Abstract
A nuclear magnetic resonance imaging device has a magnetic structure which defines a cavity for housing at least part of the body of a patient with a magnetic field which permeates at least part of the cavity, an opening provides access to the imaging cavity from outside of the magnetic structure and electrically conductive and electrically grounded shielding provided at the opening is movable between a first inactive configuration wherein the opening is substantially open and an active configuration in which the opening is at least partially closed by the shielding.
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Citations
37 Claims
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1. A nuclear magnetic resonance imaging device, comprising:
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a magnetic structure defining an imaging cavity for housing at least part of a body of a patient, the magnetic structure providing a magnetic field for permeating at least part of the imaging cavity during imaging, the magnetic structure comprising an opening for the imaging cavity, said opening providing access to the imaging cavity from outside of the magnetic structure; shielding means for at least partially closing said opening of the imaging cavity, the shielding means comprising electrically conductive material and being electrically grounded, the shielding means being secured to the magnetic structure substantially adjacent said opening; guiding means for guiding the shielding means, the shielding means being movable along the guiding means from an inactive configuration in which the opening is substantially open to an active configuration in which the shielding means at least partially closes the opening; wherein the shielding means comprises an electrically conductive frame provided substantially adjacent the opening for the imaging cavity, the shielding means further comprising a shielding member, said guiding means further comprising a guide provided in said electrically conductive frame, said shielding member being slidably mounted in said guide, the guide being electrically conductive and the shielding member electrically conductive and electrically grounded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A nuclear magnetic resonance imaging device, comprising:
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a magnetic structure defining an imaging cavity for housing at least part of a body of a patient, the magnetic structure providing a magnetic field for permeating at least part of the hinging cavity during hinging, the magnetic structure comprising an opening for the hinging cavity, said opening providing access to the imaging cavity from outside of the magneto structure; shielding means for at least partially closing said opening of the imaging cavity, the shielding means comprising electrically conductive material and being electrically grounded, the shielding means being secured to the magnetic structure substantially adjacent said opening; guiding means for guiding the shielding means, the shielding means being movable along the guiding means from an inactive configuration in which the opening is substantially open to an active configuration in which the shielding means at least partially closes the opening; wherein the shielding mans comprises an electrically conductive frame provided substantially adjacent the opening for the imaging cavity, the shielding means further comprising a shielding member, wherein the opening of the magnetic structure is defined by an upper edge, a lower edge and side edges connecting the lower and upper edges, the frame of the shielding means defining an opening having edges which are substantially parallel to the edges of the opening of the magnetic structure, said guiding means further comprising an upper sliding guide from which the shielding member hangs down, said upper sliding guide being provided in said electrically conductive frame, said shielding member being slidably mounted in said upper sliding guide, the upper sliding guide being electrically conductive and the shielding member being electrically conductive and electrically grounded, the shielding member being provided with electrical contacts at a lower edge opposite to the upper sliding guide. - View Dependent Claims (31, 32, 33)
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34. A nuclear magnetic resonance imaging device comprising:
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a U-shaped magnetic structure including two opposite poles defining an imaging cavity, said two opposite poles generating a magnetic field, said two opposite poles being supported in a spaced apart relationship by a ferromagnetic yoke having at least two opposite plates to which the poles are secured and a side member connecting the two opposite plates together and maintaining the two plates apart by a predetermined distance, whereby the side member defines the imaging cavity on at least one side, the pores and the pole supporting plates being supported in a cantilevered manner by the side member and the imaging cavity being open on other sides which are perpendicular to the plane of said poles, and shielding means for at least partially closing said open sides of said imaging cavity, said shielding means comprising an upper guide and a lower guide extending continuously along a perimeter of the opening, the upper guide and the lower guide being connected together by side elements at the two opposite ends of the guides, the guides and the side elements forming a frame of said shielding means, said side elements being provided substantially adjacent corresponding edges of the side member of the yoke, said frame of the shielding means being hinged to the magnetic structure at the ends of the upper guide, said frame being movable about an axis which is substantially parallel to a plane of said side member and to a plane of said upper plate of the yoke, at least one sliding shielding members being provided between the upper guide and the lower guide. - View Dependent Claims (35, 36, 37)
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Specification