A Design Method of Cylindrical Shim Coil
A technology of shim coil and design method, applied in instruments, measuring magnetic variables, measuring devices, etc., can solve problems such as uneven main magnetic field, and achieve the effect of improving uniformity and eliminating uneven magnetic field components
Active Publication Date: 2021-09-07
INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS
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Problems solved by technology
[0004] In order to solve the problem of inhomogeneity of the main magnetic field of the cylindrical magnet system (such as: superconducting magnet, conventional electromagnet, etc.), the patent of the present invention proposes a design method of a cylindrical shim coil for magnetic resonance imaging, using the The shimming coil designed by the method can eliminate the inhomogeneous magnetic field components of each order of the main magnetic field of the cylindrical MRI magnet system, and improve the uniformity of the main magnetic field (such as figure 1 shown)
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[0040] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0041] In this embodiment, the invention will be used to offset Correlated inhomogeneity components of the coil and used to cancel The coils of the relevant inhomogeneous components are defined as cylindrical shim coil 1 and cylindrical shim coil 2 respectively, and the two sets of cylindrical shim coils of cylindrical shim coil 1 and cylindrical shim coil 2 are The design example introduces the design method of a cylindrical shim coil for magnetic resonance imaging. The first cylindrical shim coil and the second cylindrical shim coil can be implemented separately according to ...
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The invention discloses a design method of a cylindrical shim coil. Firstly, the cylindrical shim coil is meshed to obtain each grid node; the target point is selected on the target spherical surface; and the current density flow function of the grid node is established. and the finite difference relationship between the grid node current density; set the target point magnetic field strength; establish and solve the equations between the grid node current density flow function and the z-axis direction component of the target point magnetic field strength; on the corresponding coil cylindrical surface The distributed equipotential lines are arranged with equal difference to obtain the winding mode of the shim coil. The invention is simple and effective, and provides a new idea for designing a cylindrical shim coil. The designed cylindrical shim coil can effectively eliminate the uneven magnetic field components of each order of the main magnetic field introduced by the cylindrical magnet system due to manufacturing errors. , and then improve the uniformity of the main magnetic field of the cylindrical magnet system.
Description
technical field [0001] The invention belongs to the technical field of magnetic resonance imaging coils, and in particular relates to a design method of a cylindrical shim coil. Background technique [0002] According to different working principles and application fields, magnetic resonance instrument systems can be divided into nuclear magnetic resonance (NMR) instruments, magnetic resonance imaging (MRI) instruments, and electron paramagnetic resonance (EPR) instruments. Magnets are the most important components of magnetic resonance instrument systems. One of the components of the magnetic resonance instrument, the performance of the magnetic resonance instrument depends largely on the main magnetic field B of the magnet 0 The higher the uniformity of the main magnetic field of the magnet, the higher the signal-to-noise ratio and resolution of the NMR signal obtained by the NMR instrument, and the higher the quality of the MRI image obtained by the MRI instrument. [00...
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IPC IPC(8): G01R33/34
CPCG01R33/34046
Inventor 陈方樊萌刘朝阳张志冯继文陈俊飞陈黎程鑫鲍庆嘉汪慧娟王佳鑫杨李泽
Owner INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS