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Magnet assembly

a technology of electromagnets and magnets, applied in the direction of superconducting magnets/coils, magnetic materials, using reradiation, etc., can solve the problems of mri machines being large and expensive devices, preventing the use of mri as a diagnostic tool in applications, and operators having a high degree of skill

Inactive Publication Date: 2010-09-02
EMSCAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]The present invention is aimed at provision of a compact, open and low-cost magnet for a magnetic resonance imaging (MRI) system. The magnet can offer a substantial imaging field of typically around 0.5 Tesla at moderate weight and fringe field which would facilitate its location in a wide range of environments.

Problems solved by technology

Traditionally, MRI machines are large expensive devices which have to be located in a specially constructed or adapted MRI room and require the operator to have a high degree of skill.
These aspects preclude the use of MRI as a diagnostic tool in applications where space is at a premium and where it would be desirable for the machine to be operated by, for example, nursing staff with only a limited degree of training.
An impediment to such a design is the strong attractive force between the primary field coils and the magnet yoke which may severely limit the achievable performance and practicality of the magnet design.

Method used

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Examples

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Embodiment Construction

[0051]Referring now to FIG. 1, a magnet assembly 1 comprises a C-shaped steel yoke 3. The yoke itself comprises an upper arm 5, and a lower arm 7 linked by a spine 9. Mounted on the inside surfaces 11, 13 of the free ends 15, 17 of the arms 5, 7, respectively, are upper and lower pole pieces 19, 21, surrounded by respective planar annular drive coils 23, 25. In use, the coils drive magnetic flux around the yoke to produce a substantially uniform magnetic field in the central region between the poles.

[0052]The drive coil 23 has a first side 22 facing the upper yoke arm 5 and a second side 24 facing the other coil 25. Similarly, the drive coil 25 has a first side 26 facing the lower yoke arm 7 and a second side 28 facing the other coil 23.

[0053]Referring to FIGS. 2 and 3, the pair of drive coils 23, 25 carry equal currents current i in the same sense and in series with one another. The coil formers are joined by mechanical supporting member 27 to one side of the coil in the +x directi...

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Abstract

An electromagnet comprising a ferromagnetic yoke which comprises a yoke. Mutually opposing first and second pole pieces are provided. The first pole piece is provided with a planar coil having a first side facing the yoke and a second side facing the yoke. A balancing member is arranged on the second side of the planar coil to counterbalance the attractive force between the planar coil and the yoke. The other pole piece may also be provided with a corresponding balancing member.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an assembly for an electromagnet, particularly an electromagnet of the kind intended for producing a very high intensity magnetic field such as may be used in a magnetic resonance imaging (MRI) system. However, it is also applicable to other high field applications such as, but not limited to, nuclear magnetic resonance spectrometry (NMR), electron spin resonance spectroscopy (ESR) or general physics laboratory research.BACKGROUND OF THE INVENTION[0002]Traditionally, MRI machines are large expensive devices which have to be located in a specially constructed or adapted MRI room and require the operator to have a high degree of skill. These aspects preclude the use of MRI as a diagnostic tool in applications where space is at a premium and where it would be desirable for the machine to be operated by, for example, nursing staff with only a limited degree of training. An example of such an application would be in an accident...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01R33/34H01F7/06
CPCG01R33/383H01F7/06H01F6/04H01F3/10
Inventor MCGINLEY, MARIO VINCENT JOHNRISTIC, MIHAILOBESANT, BOWDEN COLINYOUNG, ROBERT IAN
Owner EMSCAN
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