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Gradient Coil Design Method Combining Functional Function 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: 2016-08-24
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 and simulated annealing algorithms, so as to solve the technical problem that the performance of the gradient coils constructed by the prior art cannot be optimized

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  • Gradient Coil Design Method Combining Functional Function and Simulated Annealing Algorithm
  • Gradient Coil Design Method Combining Functional Function and Simulated Annealing Algorithm
  • Gradient Coil Design Method Combining Functional Function 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 combining functional and simulated annealing algorithm, which is characterized in that it includes the following steps: step 1: constructing the basis function of the flow function according to the skeleton shape of the gradient coil; step 2: according to the preset parameters Construct the functional, and solve the extremum of the functional to obtain the current density distribution; Step 3: Construct the objective function for the actual coil structure, and further optimize the initial solution obtained by solving the extremum of the functional using the simulated annealing algorithm, and the obtained The results are used as the basis for the final gradient coil wiring. The invention is much more efficient than only using the simulated annealing algorithm, and can guarantee to search for the global optimal solution, and improve the performance of the designed gradient coil. This design scheme is suitable for any gradient coil type designed using the flow 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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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/385G06F19/00
Inventor 平学伟李昌利李黎韦耿
Owner HOHAI UNIV
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