Designing method for gradient coil of self-shielding superconductive nuclear magnetic resonance imaging system

A technology of nuclear magnetic resonance imaging and design method, which can be used in computing, special data processing applications, instruments, etc., and can solve problems such as target magnetic field constraints

Inactive Publication Date: 2016-06-29
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of unnecessary target magnetic field constraints in the existing self-shielding nuclear

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  • Designing method for gradient coil of self-shielding superconductive nuclear magnetic resonance imaging system
  • Designing method for gradient coil of self-shielding superconductive nuclear magnetic resonance imaging system
  • Designing method for gradient coil of self-shielding superconductive nuclear magnetic resonance imaging system

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The following is a design embodiment of the self-shielding superconducting nuclear magnetic resonance imaging system gradient coil applying the present invention, and its design process is as follows figure 1 shown. The main coil of the gradient coil is a cylinder with a radius of 0.32m and a length of 1.38m, and the shielding coil is a cylinder with a radius of 0.37m and a length of 1.48m. Its structure is as follows figure 2 shown. The gradient strength of the designed gradient coils is set to 30mT / m. The imaging area is a spherical area with a diameter of 0.5m, and the non-imaging area under the patient's bed is not considered in the discrete calculation, such as image 3 shown. The outer 5 Gauss stray field confinement area is a cylindrical surface with a radius of 0.45m and a length of 1.45m.

[0022] In the first step, the ma...

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Abstract

The invention discloses a designing method for a gradient coil of a self-shielding superconductive nuclear magnetic resonance imaging system.The designing method comprises the steps that firstly, three-dimensional continuous triangular mesh dividing is performed on a main coil framework region and a shielding coil framework region, and an axial magnetic induction intensity coefficient matrix generated by mesh nodes in the main coil framework region and the shielding coil framework region on a target field point is calculated according to a boundary elements method; secondly, an optimization calculation model is built through a regularization method, wherein the optimization calculation model comprises two parts, the first part is deviation between the axial magnetic induction intensity generated by the mesh nodes in the main coil framework region and the shielding coil framework region on a target field point and the expected target magnetic induction intensity, the second part is the quadratic sum of the flow function curvature of the mesh nodes, and flow function values of the mesh nodes in the main coil framework region and the shielding coil framework region are obtained through solution; lastly, actual winding distribution of the gradient coil is obtained through a flow function method.

Description

technical field [0001] The invention relates to a design method for a gradient coil of a self-shielding superconducting nuclear magnetic resonance imaging system. Background technique [0002] The gradient coil is one of the components of the magnetic resonance imaging equipment, and its main function is to add another gradient magnetic field that increases (or decreases) according to the site on the main magnetic field, so as to spatially locate and encode the MRI signal. In actual work, the gradient coil system must provide at least three kinds of gradient magnetic fields, namely slice selection gradient, frequency encoding gradient and phase encoding gradient. The main indicators to measure the performance of gradient coils are imaging speed, resolution, noise level, etc. Improving the performance of gradient coils is of great significance to improving the performance of the entire nuclear magnetic resonance imaging system. [0003] The main goal of gradient coil design...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 胡洋王秋良
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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