Gradient coil design method with combination of fonctionelle and simulated annealing algorithm

A simulated annealing algorithm, gradient coil technology, applied in computing, special data processing applications, measurement devices, etc., can solve the problem that the performance of the gradient coil cannot be optimized.

Inactive Publication Date: 2014-08-27
HOHAI UNIV
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Problems solved by technology

[0007] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a gradient coil design method combining functional a

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  • Gradient coil design method with combination of fonctionelle and simulated annealing algorithm
  • Gradient coil design method with combination of fonctionelle and simulated annealing algorithm
  • Gradient coil design method with combination of fonctionelle and simulated annealing algorithm

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Embodiment Construction

[0044] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0045] refer to figure 1 As shown, the present invention proposes an optimization algorithm for designing gradient coils. This scheme is suitable for designing gradient coils of any shape, including open gradient coils, closed gradient coils; active shielded gradient coils, passive shielded gradient coils; body coils, local imaging coils, etc. In this embodiment, the implementation process of this solution is described in combination with the transverse gradient coil in the cylindrical active shielding gradient coil for whole-body imaging.

[0046] In the design scheme of the present invention, first construct the flow function base function according to the skeleton shape of the gradient coil, then construct the functional according to the preset parameters, and solve the extremum of the functional to obtain the preliminary shape of the...

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Abstract

The invention discloses a gradient coil design method with combination of a fonctionelle and a simulated annealing algorithm. The method is characterized by comprising the steps that firstly, a primary function of a stream function is built according to the framework shape of a gradient coil; secondly, the fonctionelle is built according to preset parameters, the extreme value of the fonctionelle is solved, and current density distribution is obtained; thirdly, a target function is built for an actual coil structure, the initial solution obtained for solving the extreme value of the fonctionelle is further optimized through the simulated annealing algorithm, and the obtained result is the basis of finial gradient coil wiring. Compared with an existing gradient coil design method which only adopts the simulated annealing algorithm, the efficiency is higher, it is ensured that the global optimum solution is searched for and obtained, and the performance of the designed gradient coil is improved. According to the design scheme, the method is suitable for all gradient coil types designed through the stream function method.

Description

technical field [0001] The invention relates to a gradient coil design method, in particular to a gradient coil design method combining functional and simulated annealing algorithms 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 MRI system, and its main function is to provide the MRI system with alternating gradient magnetic fields in three orthogonal directions, so as to realize the spatial positioning of the imaged object. The structure of the gradient coil mainly includes two types: closed type and open type. [0003] The shape of the open gradient coil is a planar structure, and the shape of the closed gradient coil is generally a cylindrical structure. At present, in the NMR system based on permanent magnets, open gradient coils are mostly used. In superconducting NMR systems, closed gra...

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Application Information

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IPC IPC(8): G01R33/385G06F19/00
Inventor 平学伟李昌利李黎韦耿
Owner HOHAI UNIV
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