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A Design Method of Self-Shield Gradient Coil

A technology of gradient coils and shielding coils, applied in measuring devices, measuring magnetic variables, instruments, etc., can solve the problems of high power consumption of coils and the inability to control the size of the magnetic field of shielding coils, and achieve the effect of reducing power consumption

Active Publication Date: 2021-07-20
HUIREN WANGDU MEDICAL EQUIP SCI & TECH CO LTD
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Problems solved by technology

The design method adopted is the integrated design method of the main coil and the shielding coil. This design method can design the main coil and the shielding coil at one time, but it cannot control the magnitude of the magnetic field generated by the shielding coil in the imaging area. Under the condition of reaching the required gradient field strength, The coil power consumption of the integrated design will be greater

Method used

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Embodiment Construction

[0028] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] refer to figure 1 As shown, based on the principle structure of the self-shielding gradient coil, a design method of the self-shielding gradient coil is proposed, and an embodiment of a design method of the self-shielding gradient coil of the present invention is as follows:

[0030] The designed main coil spacing is 0.46m, diameter 0.405m; shielding coil spacing 0.52m, diameter 0.435m, the designed self-shielding gradient coil target gradient magnetic field strength is 15mT / m, and the coil area is Non-linearity is not more than 5%, the specific design steps are as follows:

[0031] Step 1: According to the set main coil parameters and target points, use blender2.7 software to divide the main coil into triangular meshes, such as figure 2 As shown, the main coil is discretized.

[0032] Step 2: Use matlab to convert The sphere is divided int...

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Abstract

The invention discloses a design method of a self-shielding gradient coil. Firstly, according to the magnetic field value of the target point in the imaging area, the maximum size of the main coil of the gradient coil and the target position of the main coil in the imaging area and the shielding area are obtained through the boundary element method and the flow function method. According to the magnetic field value of the point, the target point of the shielding coil is set according to the magnetic field value of the main coil in the imaging area and the shielding area, so as to control the magnetic field value of the shielding coil in the imaging area, so as to realize the control of the power consumption of the self-shielding gradient coil. The invention adopts the design method of the self-shielding gradient coil with the above structure, which can effectively improve the efficiency of the self-shielding gradient coil and reduce the power consumption of the self-shielding gradient coil.

Description

technical field [0001] The invention relates to the field of magnetic resonance imaging, in particular to a design method of a self-shielding gradient coil. Background technique [0002] The gradient coil is one of the components of the magnetic resonance imaging equipment, and its main function is to generate a gradient magnetic field in the imaging area to realize the spatial positioning of the signal. In Magnetic Resonance Imaging (MRI), three gradient coils are needed to realize spatial positioning of signals in X, Y, and Z directions. In the process of realizing the spatial positioning of the gradient coil, due to the rapid cut-off of the gradient current, an eddy current will be generated in the metal near the gradient coil, and the magnetic field generated by the eddy current will be superimposed on the original gradient magnetic field, which will lead to inaccurate positioning of the gradient coil and produce eddy current artifacts and image distortion. [0003] At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/385G01R33/421
CPCG01R33/385G01R33/4215
Inventor 李良安陈琳鑫安学亮陈春霞
Owner HUIREN WANGDU MEDICAL EQUIP SCI & TECH CO LTD
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