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Systems and methods for reducing eddy current magnetic fields

An eddy current and magnetic field technology, applied in the field of systems and methods for reducing eddy current magnetic field, can solve problems such as manufacturing deviation, precision limitation, and limited effect of alignment relationship, and achieve the effect of eliminating negative effects and improving quality

Inactive Publication Date: 2016-12-07
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adjusting the alignment relationship between the inner gradient coil and the outer gradient coil by mechanical means has limited effect because of the limitation of the accuracy of the mechanical adjustment method, and there are other factors that will cause the eddy current magnetic field in the imaging area , one factor is the manufacturing deviation generated in the process of manufacturing the gradient coil assembly

Method used

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  • Systems and methods for reducing eddy current magnetic fields
  • Systems and methods for reducing eddy current magnetic fields
  • Systems and methods for reducing eddy current magnetic fields

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Embodiment Construction

[0037] Embodiments of the present disclosure generally relate to systems, tools and methods for eliminating or reducing eddy current magnetic fields induced by gradient coil assemblies. The gradient coil assembly may comprise a first gradient coil and a second gradient coil, the first gradient coil and the second gradient coil being arranged spatially apart. More specifically, in some embodiments, the elimination or reduction of the eddy current magnetic field can be realized by targetedly compensating at least one manufacturing deviation that causes the eddy current magnetic field generated during the manufacturing process of the gradient coil assembly . A support structure or support for non-ideally formed manufacturing deviations that can induce eddy current magnetic fields, the support structure or support for supporting the first gradient coil or the second gradient coil, for example, the support structure or support Has a conical shape. Since the manufacturing deviatio...

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Abstract

The invention discloses a system for reducing an eddy current magnetic field and a method thereof. The system comprises a main magnet, a first gradient coil and a second gradient coil. The main magnet is used for generating a main magnetic field. The first gradient coil and a first support member are associated with each other. The first gradient coil is arranged inside the main magnet. The first gradient coil applies at least a gradient magnetic field on the main magnetic field so as to carry out space encoding. The second gradient coil and a second support member are associated with each other. The second gradient coil is also arranged inside the main magnet. The second gradient coil offsets a fringe magnetic field generated by the first gradient coil so as to minimize an eddy current magnetic field generated in the main magnetic field. Any of the first gradient coil and the second gradient coil is purposely adjusted such that there is a nonzero deviant between the first gradient coil and the second gradient coil. The nonzero deviant compensates the eddy current magnetic field caused by at least a manufacture deviation. The invention also discloses a tool and a method.

Description

technical field [0001] Embodiments disclosed in the present invention relate to systems and methods, and in particular to a system and method for reducing eddy current magnetic fields. Background technique [0002] A gradient coil assembly used in at least some known magnetic resonance imaging systems includes an inner gradient coil unit and an outer gradient coil unit. The inner gradient coil unit and the outer gradient coil unit together generate at least one gradient magnetic field in the imaging region surrounded by the main magnet in the magnetic resonance imaging system, such as a gradient magnetic field along the Z-axis direction (also called a Z-channel gradient magnetic field) . The at least one gradient magnetic field is used to spatially encode the steady main magnetic field generated by the main magnet at least in one of the X-axis, Y-axis, and Z-axis directions, through which the excited magnetic field generated from the inside of the patient or target object c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/385
Inventor 华夷和T.J.霍利斯
Owner GENERAL ELECTRIC CO
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