Abstract: Methods and systems for performing current sense compensation for one or more power stages in a multiphase voltage regulator are described. A controller can be connected to a plurality of power stages through a communication interface. The controller can generate a data packet including a command to obtain temperature information and an address that identifies a specific power stage among the plurality of power stages. The controller can send the data packet to the plurality of power stages using the communication interface. The controller can receive temperature information of the specific power stage from the specific power stage through the communication interface. The controller can compensate a sensed current of the specific power stage based on the received temperature information of the specific power stage.

Abstract: A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.

Abstract: The present invention relates to a magnetic field adjustment system for use in a magnetic resonance imaging (MRI) system and a respective method. The magnetic field adjustment system comprises a first magnetic field generating assembly and an additional assembly. Wherein the first magnetic field generating assembly is used for generating a first magnetic field required by the MRI; and the additional assembly, including a switch and a current branch line, is used for cooperating with the first magnetic field generating assembly to generate a second magnetic field required by the MRI.

Abstract: A system for energizing a main coil of superconducting magnet in a magnetic resonance imaging (MRI) system includes a cryostat comprising a housing. A first coil is positioned within the housing of the cryostat. Alternatively, the first coil may be positioned external to the housing of the cryostat. A second coil is coupled to the first coil and positioned external to the housing of the cryostat. The second coil is configured to inductively couple to the main coil. A controller is coupled to the first coil and the second coil and is configured to control the first coil and the second coil to induce current in the main coil.

Abstract: The present invention relates to a magnetic field adjustment system for use in a magnetic resonance imaging (MRI) system and a respective method. The magnetic field adjustment system comprises a first magnetic field generating assembly and an additional assembly. Wherein the first magnetic field generating assembly is used for generating a first magnetic field required by the MRI; and the additional assembly, including a switch and a current branch line, is used for cooperating with the first magnetic field generating assembly to generate a second magnetic field required by the MRI.

Abstract: A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.

Abstract: A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.

Abstract: The present application discloses a gradient coil apparatus for a Magnetic Resonance Imaging (MRI) system that comprises a cylindrical gradient coil assembly having a length along an axis and comprising an X-gradient coil, a Y-gradient coil and a Z-gradient coil. The gradient coil assembly further comprises an intubation channel, wherein the intubation channel extends radially from the axis and along at least a portion of the length.

Abstract: A system for energizing a main coil of superconducting magnet in a magnetic resonance imaging (MRI) system includes a cryostat comprising a housing. A first coil is positioned within the housing of the cryostat. Alternatively, the first coil may be positioned external to the housing of the cryostat. A second coil is coupled to the first coil and positioned external to the housing of the cryostat. The second coil is configured to inductively couple to the main coil. A controller is coupled to the first coil and the second coil and is configured to control the first coil and the second coil to induce current in the main coil.

Abstract: An RF body coil having enhanced acoustic deadening properties for an MR scanning apparatus is disclosed. The RF body coil includes an RF support form and RF electronics affixed to the RF support form, with the RF electronics comprising a plurality of RF legs. The RF support form further includes an inner structural layer, an outer structural layer, and a middle layer sandwiched between the inner structural layer and the outer structural layer, the middle layer comprising a layer of viscoelastic material configured to increase the mechanical damping of the RF body coil so as to reduce RF body coil vibration.

Abstract: A composite RF body coil liner for reducing acoustic noise in an MR System is disclosed. The composite RF body coil liner includes an inner surface layer, an outer surface layer, a fire retardant layer positioned between the inner surface layer and the outer surface layer, and an acoustic barrier positioned between the inner surface layer and the outer surface layer, with the acoustic barrier configured to increase the mechanical damping of the RF body coil so as to reduce RF body coil vibration.

Abstract: An apparatus and method to reduce noise in magnetic resonance imaging (MRI) systems are provided. One MRI system includes a gantry having a bore therethrough and at least one radio frequency (RF) coil supported by the gantry for imaging an object within the bore. The MRI system also includes a vacuum space between the at least one RF coil and the bore.

Abstract: An MRI apparatus and method is disclosed comprising a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images. The RF coil assembly comprises an RF tube, a plurality of electrically conductive members disposed around the RF tube and configured to transmit RF excitation pulses, a plurality of electrical components coupled to the electrically conductive members, and at least one thermally conductive substrate mounted upon the RF tube, wherein one of the plurality of electrically conductive members and the plurality of electrical components is mounted to the at least one thermally conductive substrate and is in thermal contact therewith.

Abstract: A composite RF body coil liner for reducing acoustic noise in an MR System is disclosed. The composite RF body coil liner includes an inner surface layer, an outer surface layer, a fire retardant layer positioned between the inner surface layer and the outer surface layer, and an acoustic barrier positioned between the inner surface layer and the outer surface layer, with the acoustic barrier configured to increase the mechanical damping of the RF body coil so as to reduce RF body coil vibration.

Abstract: A system and method for modeling gradient coil operation induced magnetic field drift include a computer programmed to acquire a pulse sequence to be applied during an MR scan and determine a power spectrum of a plurality of gradient pulses of the pulse sequence. The computer is also programmed to calculate a drift of the magnetic field attributable to application of the plurality of gradient pulses by the plurality of gradient coils during application of the pulse sequence and apply the pulse sequence during the MR scan. The computer is further programmed to acquire MR data based on application of the pulse sequence, correct the acquired MR data based on the calculated drift of the magnetic field, and reconstruct an image based on the corrected MR data.

Abstract: An RF body coil having enhanced acoustic deadening properties for an MR scanning apparatus is disclosed. The RF body coil includes an RF support form and RF electronics affixed to the RF support form, with the RF electronics comprising a plurality of RF legs. The RF support form further includes an inner structural layer, an outer structural layer, and a middle layer sandwiched between the inner structural layer and the outer structural layer, the middle layer comprising a layer of viscoelastic material configured to increase the mechanical damping of the RF body coil so as to reduce RF body coil vibration.

Abstract: An apparatus and method to reduce noise in magnetic resonance imaging (MRI) systems are provided. One MRI system includes a gantry having a bore therethrough and at least one radio frequency (RF) coil supported by the gantry for imaging an object within the bore. The MRI system also includes a vacuum space between the at least one RF coil and the bore.

Abstract: A system and method for modeling gradient coil operation induced magnetic field drift include a computer programmed to acquire a pulse sequence to be applied during an MR scan and determine a power spectrum of a plurality of gradient pulses of the pulse sequence. The computer is also programmed to calculate a drift of the magnetic field attributable to application of the plurality of gradient pulses by the plurality of gradient coils during application of the pulse sequence and apply the pulse sequence during the MR scan. The computer is further programmed to acquire MR data based on application of the pulse sequence, correct the acquired MR data based on the calculated drift of the magnetic field, and reconstruct an image based on the corrected MR data.

Abstract: An MRI apparatus and method is disclosed comprising a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images. The RF coil assembly comprises an RF tube, a plurality of electrically conductive members disposed around the RF tube and configured to transmit RF excitation pulses, a plurality of electrical components coupled to the electrically conductive members, and at least one thermally conductive substrate mounted upon the RF tube, wherein one of the plurality of electrically conductive members and the plurality of electrical components is mounted to the at least one thermally conductive substrate and is in thermal contact therewith.