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Non-wound gradient coil for magnetic resonance imaging system and its design method

A technology of magnetic resonance imaging and gradient coils, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problem of increasing energy consumption, heat generation and system response time, reducing the space utilization rate of magnetic resonance systems, and increasing gradient coils Inductance, resistance and other issues to achieve the effect of ensuring high consistency, improving space utilization, and reducing coil resistance

Active Publication Date: 2020-01-14
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the length of the coil increases, which increases the space required for the coil and reduces the space utilization of the magnetic resonance system; Increased energy consumption, heat generation and system response time

Method used

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  • Non-wound gradient coil for magnetic resonance imaging system and its design method
  • Non-wound gradient coil for magnetic resonance imaging system and its design method
  • Non-wound gradient coil for magnetic resonance imaging system and its design method

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Experimental program
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Effect test

Embodiment 1

[0060] The non-wound gradient coil and its design method for the magnetic resonance imaging system of the present invention will be described in the form of parameter structure optimization.

[0061] Step 1: Parametric modeling: introduce design variables, objective function to establish a non-winding gradient coil analysis model, such as figure 1 Shown is the physical model of a cylindrical gradient coil; where

[0062] Create a linetype f(r 0 ,θ,z) can be expressed as:

[0063]

[0064] Among them, (r 0 ,θ,z) corresponds to the coordinates of the line in the cylindrical coordinate system, r 0 is the radius of the cylindrical design surface, and g (θ) is the characteristic parameter equation of the selected line type (chosen in this embodiment n=2,4,6,..., b, n are design parameters, and the parametric equation of this patent is not limited to this form);

[0065] According to the Biot-Savart law

[0066]

[0067] in, is the field point coordinates, is the co...

Embodiment 2

[0076] The non-wound gradient coil and its design method for the magnetic resonance imaging system of the present invention will be described below in the way of topology optimization.

[0077] Step 1: If Figure 3a and Figure 3b As shown, the topology optimization of the continuum is used, and the physical quantity of the electromagnetic coil (such as the electrical conductivity σ(ρ)) is used as the design variable to optimize the distribution of the conductive material; the design variable can be expressed as:

[0078] σ(ρ)=σ Air +ρ p (σ Cu -σ Air )

[0079] where σ Air is the conductivity of air, σ Cu is the conductivity of the conductive material used, copper is used in this model, p is the penalty term; ρ is the design variable:

[0080]

[0081] The design variables satisfy the continuity equation:

[0082]

[0083] where V is the electric potential;

[0084] Then according to the Biot-Savart law:

[0085]

[0086] B available z expression for:

[...

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Abstract

The invention relates to a non-winding gradient coil for a magnetic resonance imaging system and a design method thereof, belonging to the field of coil design and manufacture of a magnetic resonance system. Aiming at the shortcomings of the existing winding gradient coils, the present invention proposes to replace the existing winding gradient coils with non-winding gradient coils. The invention helps to expand the imaging space, shorten the imaging time, reduce power consumption, reduce the eddy current effect, reduce the volume of equipment, etc., while improving the quality of MRI imaging and saving costs. On the other hand, the present invention proposes a new coil configuration, which can effectively reduce the influence of self-inductance and facilitate the rapid switching of the magnetic field; reduce the number of coils and ensure high consistency of coil excitation signals. The design method provided by the invention proposes manufacturing methods such as 3D printing and etching, which effectively improves the manufacturing accuracy of the coil and realizes the manufacturing problem of the complex shape coil. The invention solves the problems of low manufacturing precision and difficult manufacturing of complicated shapes in the existing winding manufacturing method.

Description

technical field [0001] The invention relates to the field of design and manufacture of magnetic resonance system gradient coils, in particular to a non-winding gradient coil for a magnetic resonance imaging system and a design method thereof. Background technique [0002] The gradient coil is the core functional component of the magnetic resonance system, and its performance parameters such as linearity and inductance will directly affect the imaging quality and response time of the magnetic resonance imaging system. At present, the existing gradient coils are wound to generate the target magnetic field. In order to achieve the winding form, it is necessary to add additional loops of the coil. On the one hand, the length of the coil increases, which increases the space required for the coil and reduces the space utilization of the magnetic resonance system; Increased energy consumption, heat generation and system response time. Contents of the invention [0003] Aiming ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/385
CPCG01R33/385G01R33/3858
Inventor 刘震宇潘辉王强龙
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI