Cylindrical transverse self-shielding gradient coil design method

A technology of gradient coils and design methods, which is applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems that the performance of gradient coils cannot be optimized.

Active Publication Date: 2016-03-30
HOHAI UNIV
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Problems solved by technology

[0005] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a cylindrical self-shielding gradient coil design method to solve the problem that the performance of the saddle-shaped gradient coil cannot be optimized

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  • Cylindrical transverse self-shielding gradient coil design method
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  • Cylindrical transverse self-shielding gradient coil design method

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Embodiment Construction

[0052] The invention proposes a design method for designing a cylindrical self-shielding gradient coil. Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0053] This application is supported by the Youth Fund Project of the Natural Science Foundation of Jiangsu Province (Project Approval No.: BK20130854).

[0054]In a superconducting NMR system, both the superconducting magnet and the gradient coil are cylindrical structures, and the gradient coil is installed inside the superconducting magnet. Because the alternating current...

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Abstract

The invention discloses a cylindrical transverse self-shielding gradient coil design method. The frame of the self-shielding gradient coil includes a main coil frame, a shielding coil frame, and a connecting surface between the main coil frame and the shielding coil frame. The design method includes that at first, preset parameters needed by a gradient coil are determined, and a self-shielding gradient coil frame is mapped into a two-dimensional plane structure, particularly, the main coil frame and the shielding coil frame are mapped into two adjacent rectangular planes, the connecting surface between the main coil frame and the shielding coil frame is mapped into a common edge of the two rectangular planes, and then in the two-dimensional plane structure, the stream function base function is constructed and the objective function related to the current density is established, and the two-dimensional plane structure of the gradient coil is obtained by solving the extreme value of the objective function, and at the end, the two-dimensional plane structure is mapped into an actual three-dimensional structure. Compared with a conventional saddle gradient coil, the self-shielding gradient coil has better performance.

Description

technical field [0001] The invention relates to a design method of a gradient coil, in particular to a design method of a cylindrical self-shielding gradient coil in a nuclear magnetic resonance imaging system. The invention belongs to the field of nuclear magnetic resonance imaging system component design. Background technique [0002] The gradient coil is one of the key components of the NMR system, and its main function is to provide the magnetic resonance imaging system (MRI) with gradient magnetic fields in three orthogonal directions for spatial positioning of the imaging target. The basic indicators to measure the performance of gradient coils include gradient field strength G, linearity E, switching rate, etc. Its basic structure has two types: flat plate type and cylindrical type. [0003] In a superconducting nuclear magnetic resonance system (MRI), a cylindrical gradient coil structure is generally used. During imaging, if the imaging aperture is too small, or ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/385
CPCG01R33/385
Inventor 平学伟朱紫辉殷兴辉李黎
Owner HOHAI UNIV
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