Method for designing low-field nuclear magnetic resonance biplanar gradient coil

A low-field nuclear magnetic resonance, gradient coil technology, applied in magnetic resonance measurement, computer-aided design, design optimization/simulation, etc., to achieve the effect of simple derivation and solving the problem of limited size coils

Inactive Publication Date: 2019-08-23
江苏麦格迈医学科技有限公司
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Problems solved by technology

[0005] In order to solve the problem of finite-size gradient coil design, the present invention provides a method for the design of low-field nuclear magnetic resonance dual-plane gradient coils, which directly performs Fourier expansion on the current density, and the derivation is simple and suitable for numerical calculation.

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  • Method for designing low-field nuclear magnetic resonance biplanar gradient coil
  • Method for designing low-field nuclear magnetic resonance biplanar gradient coil
  • Method for designing low-field nuclear magnetic resonance biplanar gradient coil

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] All the embodiments listed below are designed with the following parameters: the gradient coil maximum radius is ρ m =42mm, the minimum radius is ρ 0 =1mm, the distance from the plane of the gradient coil to the origin a=23mm, the magnetic field gradient value G i =25mTm -1 , i=x, y, z. In theory, the larger the Q value, the better the linearity, but the larger the calculation amount, the greater the efficiency and impedance of the coil. Finally, Q=3, and the number of coil turns N=16.

[0016] Such as figure 1 — Figure 5 Shown, a kind of method for low-field nuclear magnetic resonance biplane type gradient coil design is characterized in that, comprises the following steps:

[0017] (1) Given the preset condition of the planar gradient coil and the size of the plane, the preset condition includes the area range of the gradient coil, the gradien...

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Abstract

The invention relates to a method for designing a low-field nuclear magnetic resonance biplanar gradient coil. The method is improved by a classic target field method. The current density distributionis limited in a limited surface, Fourier expansion is directly carried out on the current density, then a gradient coil design problem is attributed to solving of a matrix equation problem, the matrix equation is solved, a biplanar current density coefficient can be obtained, and a wiring track of a gradient coil is drawn by utilizing an isoline diagram of a flow function. Compared with a traditional design method, the method has the advantages that the limited-size coil problem is solved, derivation is simpler, and the method is more suitable for numerical calculation on a computer.

Description

technical field [0001] The invention relates to a method for designing a double-plane gradient coil for low-field nuclear magnetic resonance. Background technique [0002] With the wide application of nuclear magnetic resonance spectrometers in the fields of biology, chemistry, science, and quality control, low-field permanent magnets have become an important research direction as the main magnet of nuclear magnetic resonance spectrometers. Compared with traditional superconducting magnets, No cryogenic equipment is required, the volume and mass are small, the cost is low, and it is easy to carry; and compared with the cylindrical permanent magnet, the biplane design is simpler. [0003] Gradient magnetic fields involve the first-order partial derivatives of magnetic fields and are used to generate nominal spatial encoding for tissue imaging, whose performance determines the image quality of MRI. In an MRI system, in order to determine the spatial position information of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01R33/34
CPCG01R33/34007G06F30/20
Inventor 胡剑雄臧波
Owner 江苏麦格迈医学科技有限公司
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