Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method
After the production of the gradient coil of the magnetic resonance imaging system, electromagnetic field testing is required to verify whether the assembly accuracy meets the electromagnetic field requirements. Since the passive magnetic field Bz satisfies the Laplace,s equation and is a harmonic f...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Chinese Journal of Medical Instrumentation
2025-05-01
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| Series: | Zhongguo yiliao qixie zazhi |
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| Online Access: | https://zgylqxzz.xml-journal.net/article/doi/10.12455/j.issn.1671-7104.240596 |
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| author | Xiaotao ZHANG Yicheng LI Zhanping ZHENG Mingke WANG Like FENG Congbo LI |
| author_facet | Xiaotao ZHANG Yicheng LI Zhanping ZHENG Mingke WANG Like FENG Congbo LI |
| author_sort | Xiaotao ZHANG |
| collection | DOAJ |
| description | After the production of the gradient coil of the magnetic resonance imaging system, electromagnetic field testing is required to verify whether the assembly accuracy meets the electromagnetic field requirements. Since the passive magnetic field Bz satisfies the Laplace,s equation and is a harmonic function, and according to the extreme value principle of harmonic function, the maximum or minimum values of Bz can only appear on the boundaries, so the observation points of the magnetic field are generally selected on the surface of the spherical imaging area. For superconducting magnets used for human body magnetic resonance imaging, a spherical area with a center diameter of 40~50 cm is generally selected as the shimming target area. Only the field value of the target area needs to be measured, and the spherical harmonic coefficients obtained after data processing are used to determine the magnetic field performance of the gradient coil. There are many testing principles and methods for electromagnetic fields, so there is no unified way and method in the field of commercial applications. This article is based on the Gauss-Legendre numerical integration, measures and analyzes the magnetic field performance of gradient coils by building a data acquisition system, and this article applies numerical analysis methods to calculate the spherical harmonic coefficients of the magnetic field using discrete test data, providing a feasible method for the production and testing of gradient coils. |
| format | Article |
| id | doaj-art-90cec7e84d02439db6c3867f14a9d00a |
| institution | Kabale University |
| issn | 1671-7104 |
| language | zho |
| publishDate | 2025-05-01 |
| publisher | Editorial Office of Chinese Journal of Medical Instrumentation |
| record_format | Article |
| series | Zhongguo yiliao qixie zazhi |
| spelling | doaj-art-90cec7e84d02439db6c3867f14a9d00a2025-08-20T03:47:19ZzhoEditorial Office of Chinese Journal of Medical InstrumentationZhongguo yiliao qixie zazhi1671-71042025-05-0149326326810.12455/j.issn.1671-7104.2405962024-0596Research on MRI Gradient Coil Magnetic Field Induced Eddy Current MethodXiaotao ZHANG0Yicheng LI1Zhanping ZHENG2Mingke WANG3Like FENG4Congbo LI5Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, 518057After the production of the gradient coil of the magnetic resonance imaging system, electromagnetic field testing is required to verify whether the assembly accuracy meets the electromagnetic field requirements. Since the passive magnetic field Bz satisfies the Laplace,s equation and is a harmonic function, and according to the extreme value principle of harmonic function, the maximum or minimum values of Bz can only appear on the boundaries, so the observation points of the magnetic field are generally selected on the surface of the spherical imaging area. For superconducting magnets used for human body magnetic resonance imaging, a spherical area with a center diameter of 40~50 cm is generally selected as the shimming target area. Only the field value of the target area needs to be measured, and the spherical harmonic coefficients obtained after data processing are used to determine the magnetic field performance of the gradient coil. There are many testing principles and methods for electromagnetic fields, so there is no unified way and method in the field of commercial applications. This article is based on the Gauss-Legendre numerical integration, measures and analyzes the magnetic field performance of gradient coils by building a data acquisition system, and this article applies numerical analysis methods to calculate the spherical harmonic coefficients of the magnetic field using discrete test data, providing a feasible method for the production and testing of gradient coils.https://zgylqxzz.xml-journal.net/article/doi/10.12455/j.issn.1671-7104.240596gradient coilspherical harmonic coefficientgauss-legendre numerical integrationmagnetic resonance imaging (mri) system |
| spellingShingle | Xiaotao ZHANG Yicheng LI Zhanping ZHENG Mingke WANG Like FENG Congbo LI Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method Zhongguo yiliao qixie zazhi gradient coil spherical harmonic coefficient gauss-legendre numerical integration magnetic resonance imaging (mri) system |
| title | Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method |
| title_full | Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method |
| title_fullStr | Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method |
| title_full_unstemmed | Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method |
| title_short | Research on MRI Gradient Coil Magnetic Field Induced Eddy Current Method |
| title_sort | research on mri gradient coil magnetic field induced eddy current method |
| topic | gradient coil spherical harmonic coefficient gauss-legendre numerical integration magnetic resonance imaging (mri) system |
| url | https://zgylqxzz.xml-journal.net/article/doi/10.12455/j.issn.1671-7104.240596 |
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