Abstract: A method for reducing a tendency of a thermal radiation shield for a superconducting magnet of a magnetic resonance imaging system to vibrate. A mass per unit area of the material of the thermal radiation shield is locally modified in a random or pseudo-random pattern.

Abstract: An electromagnet for a Magnetic Resonance Imaging (MRI) apparatus. The electromagnet includes a coil configured to generate a magnetic field. The coil has a first axially outer surface, and a support element configured to mount the coil in the MRI. The support element is bonded to the first axially outer surface of the coil.

Abstract: A method for reducing a tendency of a thermal radiation shield for a superconducting magnet of a magnetic resonance imaging system to vibrate. A mass per unit area of the material of the thermal radiation shield is locally modified in a random or pseudo-random pattern.

Abstract: An electromagnet for a Magnetic Resonance Imaging (MRI) apparatus. The electromagnet includes a coil configured to generate a magnetic field. The coil has a first axially outer surface, and a support element configured to mount the coil in the MRI. The support element is bonded to the first axially outer surface of the coil.

Abstract: An assembly for generating a superconducting magnetic field with high stability comprises a main power supply unit arranged to provide a main current to generate a superconducting magnetic field, a magnetic field measurement device for measuring the generated magnetic field, and an auxiliary power supply unit arranged to output an auxiliary current based on the measured magnetic field.

Abstract: An assembly for generating a superconducting magnetic field with high stability comprises a main power supply unit arranged to provide a main current to generate a superconducting magnetic field, a magnetic field measurement device for measuring the generated magnetic field, and an auxiliary power supply unit arranged to output an auxiliary current based on the measured magnetic field.

Abstract: A system for NMR assessing a sample or a series of samples in turn which comprises means for applying a static magnetic field in a first direction through the sample, pre-polarizing means for first applying a magnetic field in substantially the same direction to the sample, means for applying an alternating excitation magnetic field in a second different direction through the sample, means for sensing energy emitted by the sample in response to the excitation magnetic field, and means arranged to provide an indication of an assessment of the sample based on the energy emitted by the sample in response to the excitation magnetic field.

Abstract: An assembly for generating a superconducting magnetic field with high stability comprises a main power supply unit arranged to provide a main current to generate a superconducting magnetic field, a magnetic field measurement device for measuring the generated magnetic field, and an auxiliary power supply unit arranged to output an auxiliary current based on the measured magnetic field.

Abstract: A system for NMR assessing a sample or a series of samples in turn which comprises means for applying a static magnetic field in a first direction through the sample, pre-polarising means for first applying a magnetic field in substantially the same direction to the sample, means for applying an alternating excitation magnetic field in a second different direction through the sample, means for sensing energy emitted by the sample in response to the excitation magnetic field, and means arranged to provide an indication of an assessment of the sample based on the energy emitted by the sample in response to the excitation magnetic field.

Abstract: Magnetic shielding for surrounding a magnet generating a magnetic field of maximum magnetic flux density substantially in excess of 5 Gauss, so as to reduce the magnetic flux density outside the shielding to no more than 5 Gauss wherein at least part of the shielding is composed of sheets of grain-oriented steel.

Abstract: A superconducting magnet system comprising a superconducting magnet, itself comprising a plurality of magnet coils, arranged to protect quench heaters yet provide effective quench protection.

Abstract: A cryogenic magnet control system has a number of magnet coils each formed by superconductive material wound on a former and a supply for energizing the magnet coils to generate an operational magnetic field of predetermined strength and homogeneity, wherein each former also supports control wineings of a non-superconductive material provided as over-bindings upon the magnet.

Abstract: The present invention provides a cryogenic magnet control system comprising a plurality of magnet coils each comprising superconductive material wound on a former and means for energising said magnet coils to generate an operational magnetic field of predetermined strength and homogeneity. Each former also supports control windings of a non-superconductive material. The control windings are adapted to effect two or more of: (a) restraining differential expansion as between said magnet coils and their respective formers; (b) supporting eddy currents configured and dimensioned to resist magnetic field expansion associated with quenching of said operational magnetic field; and (c) automatically providing localised heating for at least some of the magnet coils responsive to a quench event, thereby to distribute a quench amongst said at least some magnet coils.

Abstract: A trailer for housing a mobile MRI system has magnetic shielding in the form of a plurality of sheets of magnetic material which are supported within the trailer, by a rigid supporting structure or frame. The layers are arranged in a stacked or laminar configuration with the laterally longest layer disposed inward of the remaining layers, such that the width of the gap between that layer and the exterior walls of the trailer at the lateral extremities of the shielding is greater than its width in a central area. The rigid frame maintains the gap and prevents contacting of the shielding and the trailer walls.