Active resistive shimming for MRI devices
First Claim
1. An active resistive shim coil comprising:
- two quadrants connected in series to a first power channel and disposed on opposing sides of a central plane; and
another two quadrants connected in series to a second power channel and disposed on the opposing sides of the central plane.
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Accused Products
Abstract
Active resistive shim coil assemblies may be used in magnetic resonance imaging (MRI) systems to reduce in-homogeneity of the magnetic field in the imaging volume. Disclosed embodiments may be used with continuous systems, gapped cylindrical systems, or vertically gapped systems. Disclosed embodiments may also be used with an open MRI system and can be used with an instrument placed in the gap of the MRI system. An exemplary embodiment of the active resistive shim coil assembly of the present disclosure includes active resistive shim coils each operable to be energized by separate currents through a plurality of power channels. In some embodiments, the disclosed active resistive shim coil assemblies allow for various degrees of freedom to shim out field in-homogeneity.
97 Citations
24 Claims
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1. An active resistive shim coil comprising:
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two quadrants connected in series to a first power channel and disposed on opposing sides of a central plane; and another two quadrants connected in series to a second power channel and disposed on the opposing sides of the central plane. - View Dependent Claims (2, 3, 4)
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5. A system comprising:
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an active resistive shim coil assembly comprising a plurality of active resistive shim coils comprising an X-shim coil, a Y-shim coil, and a Z-shim coil; and wherein the X-shim coil comprises four quadrants operable to be energized by currents from a first plurality of power channels, the Y-shim coil comprises four quadrants operable to be energized by currents from a second plurality of power channels, and the Z-shim coil comprises two halves operable to be energized by currents from a third plurality of respective power channels. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An active resistive shim coil assembly comprising:
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an X-shim coil comprising four quadrants, wherein a first pair of the four quadrants of the X-shim coil are disposed symmetrically about a plane normal to a longitudinal axis of the active resistive shim coil assembly, and a second pair of the four quadrants of the X-shim coil are disposed symmetrically about the plane; a Y-shim coil comprising four quadrants, wherein a first pair of the four quadrants of the Y-shim coil are disposed symmetrically about the plane and a second pair of the four quadrants of the Y-shim coil are disposed symmetrically about the plane; and a Z-shim coil comprising a pair of halves disposed symmetrically about the plane; wherein at least one of the X-shim, Y-shim, and Z-shim coils are operable to be energized by separate currents through a plurality of power channels. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification