Abstract: A magnetic resonance imaging (MRI) coil system is provided that includes a gradient coil and a flow inlet. The gradient coil includes a flow channel passing therethrough. The gradient coil defines an eye and an end. The eye is disposed proximate the center of the gradient coil. The flow inlet is disposed along the gradient coil between the eye and the end. Cooling fluid is provided to the gradient coil via the flow inlet, and removed from the gradient coil via the eye and the end.

Abstract: A magnetic resonance imaging (MRI) coil system is provided that includes a gradient coil and a flow inlet. The gradient coil includes a flow channel passing therethrough. The gradient coil defines an eye and an end. The eye is disposed proximate the center of the gradient coil. The flow inlet is disposed along the gradient coil between the eye and the end. Cooling fluid is provided to the gradient coil via the flow inlet, and removed from the gradient coil via the eye and the end.

Abstract: An MRI system for imaging a subject is provided. The MRI system includes a magnet assembly that includes a gradient coil having a hollow conducting wire. The hollow conducting wire includes a body defining a passageway, and one or more conductors disposed within the body around the passageway.

Abstract: Methods and systems are provided for a variable wire dimension gradient coil. In one example, a gradient coil includes a length of coiled wire, the wire comprising a first segment having a first width and a second segment having a second width, the second width smaller than the first width.

Abstract: A method for improving image quality in a magnetic resonance imaging system, the method includes rapidly modulating an electrical current in a matrix shim coil of the magnetic resonance imaging system to compensate high order eddy currents in the system.

Abstract: A magnetic resonance imaging (MRI) gradient coil assembly includes a substrate and first hollow conductor coil. The substrate has a surface. The first hollow conductor coil includes a first coiled portion and a first end run portion joined by a first eye lead portion. The first coiled portion defines a series of increasing radius loops disposed on the surface of the substrate, with an outer loop of the first coiled portion defining a coiled portion boundary. The first eye lead portion is disposed in a central portion of the first coiled portion. The first end run portion extends continuously from the first coiled portion via the first eye lead portion beyond the coiled portion boundary.

Abstract: A connection system includes a connector electrically connected and fixedly secured to a gradient coil assembly of a magnetic resonance imaging device, a cable block fixedly secured to a magnet of the magnetic resonance imaging device substantially above the connector, and a cable having a first end electrically connected to the cable block and a second end received by the connector and forming an electrical connection between the connector and the cable block.

Abstract: Methods and systems are provided for a gradient coil assembly. In one embodiment, a gradient coil assembly comprises a hollow, first gradient coil and a solid, second gradient coil co-wound with the first gradient coil. In this way, the turn density of the gradient coil assembly may be increased.

Abstract: An MRI system for imaging a subject is provided. The MRI system includes a magnet assembly that includes a gradient coil having a hollow conducting wire. The hollow conducting wire includes a body defining a passageway, and one or more conductors disposed within the body around the passageway.

Abstract: Various methods and systems are provided for correcting k-space trajectories. In one embodiment, a system comprises a coil configured to generate a magnetic field, a plurality of magnetic field probes positioned at the coil and configured to measure the magnetic field, and a controller communicatively coupled to the plurality of magnetic field probes and including instructions stored in non-transitory memory that when executed cause the controller to: receive measurements of the magnetic field from the plurality of magnetic field probes; calculate corrections to positions of acquired magnetic resonance signals in spatial-frequency space based on the received measurements; apply the corrections to the positions to generate corrected magnetic resonance signals; and reconstruct an image from the corrected magnetic resonance signals. In this way, image artifacts caused by eddy currents can be reduced.

Abstract: A method for improving image quality in a magnetic resonance imaging system, the method includes rapidly modulating an electrical current in a matrix shim coil of the magnetic resonance imaging system to compensate high order eddy currents in the system.

Abstract: Embodiments of the invention are utilized to improve shimming capability while reducing radial space and the volume required to contain active shim coils by nesting the coils of different degrees and orders inside each other and limiting the azimuthal span of the individual saddle coils. This allows two or more radial shim sets to be combined together in the same layer resulting in a significant radial savings that increases the useable portion of an MRI system.

Abstract: Methods and systems are provided for a variable wire dimension gradient coil. In one example, a gradient coil includes a length of coiled wire, the wire comprising a first segment having a first width and a second segment having a second width, the second width smaller than the first width.

Abstract: A connection system includes a connector electrically connected and fixedly secured to a gradient coil assembly of a magnetic resonance imaging device, a cable block fixedly secured to a magnet of the magnetic resonance imaging device substantially above the connector, and a cable having a first end electrically connected to the cable block and a second end received by the connector and forming an electrical connection between the connector and the cable block.

Abstract: Methods and systems are provided for a gradient coil assembly. In one embodiment, a gradient coil assembly comprises a hollow, first gradient coil and a solid, second gradient coil co-wound with the first gradient coil. In this way, the turn density of the gradient coil assembly may be increased.

Abstract: A magnetic resonance imaging (MRI) gradient coil assembly includes a substrate and first hollow conductor coil. The substrate has a surface. The first hollow conductor coil includes a first coiled portion and a first end run portion joined by a first eye lead portion. The first coiled portion defines a series of increasing radius loops disposed on the surface of the substrate, with an outer loop of the first coiled portion defining a coiled portion boundary. The first eye lead portion is disposed in a central portion of the first coiled portion. The first end run portion extends continuously from the first coiled portion via the first eye lead portion beyond the coiled portion boundary.

Abstract: Embodiments of the invention are utilized to improve shimming capability while reducing radial space and the volume required to contain active shim coils by nesting the coils of different degrees and orders inside each other and limiting the azimuthal span of the individual saddle coils. This allows two or more radial shim sets to be combined together in the same layer resulting in a significant radial savings that increases the useable portion of an MRI system.

Abstract: A gradient coil apparatus for a magnetic resonance imaging (MRI) system includes an inner gradient coil assembly having at least one inner gradient coil and an outer gradient coil assembly disposed around the inner gradient coil assembly and having at least one outer gradient coil. A matrix shim coil is positioned at a radius within the gradient coil apparatus and is configured to provide high order shimming.

Abstract: A matrix shim coil apparatus includes a plurality of coils configured to provide high order shimming. Each coil has a figure eight shape and a first loop and a second loop. In another embodiment, each coil is further folded along an axis of the coil creating a folded coil with an upper portion and a lower portion.

Abstract: Magnetic resonance imaging systems having gradient coil assemblies employing a liquid dielectric medium are provided. In one embodiment, a magnetic resonance imaging system includes a gradient coil assembly with a plurality of gradient coils. In the gradient coil assembly, at least two of the gradient coils are electrically separated from one another by a fluid medium.