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论文:2015,Vol:33,Issue(3):451-455 |
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引用本文： |
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张鹏, 史仪凯, 王文东, 袁小庆. 涡流场对MR兼容性影响建模与分析[J]. 西北工业大学学报 |
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Zhang Peng, Shi Yikai, Wang Wendong, Yuan Xiaoqing. Modeling and Analysis of Eddy Current on MR Compatibility[J]. Northwestern polytechnical university |
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| 涡流场对MR兼容性影响建模与分析 |
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| 张鹏, 史仪凯, 王文东, 袁小庆 |
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| 西北工业大学 机电学院, 陕西 西安 710072 |
| 摘要: |
| 材料、驱动方式和涡电流对核磁共振兼容性有重要影响。建立了C型永磁体涡流场仿真环境,采用有限元方法分析不同材料、不同工作状态(静态、动态)下涡流场的分布以及变化规律;获得不同材料在成像区域内的涡流场强度。结果表明,同一工作频率下,静态涡流场随相位的不断增大逐渐减小;动态涡流场在未进入成像区域时随距离的减小而增大并在成像区域边缘形成极值;执行机构在进入成像区域时内部涡流场逐渐衰减,处于成像区域中心时达到稳定状态。 |
| 关键词:
核磁共振
涡流场
兼容性
仿真分析
驱动器
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| Modeling and Analysis of Eddy Current on MR Compatibility |
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| Zhang Peng, Shi Yikai, Wang Wendong, Yuan Xiaoqing |
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| School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| Materials, actuators and eddy currents have significant effects on magnetic resonance-compatibility under magnetic resonance environment. This paper presented a C type-based simulation environment of permanent magnets to investigate the influence of different materials and different working mode (static and dynamic) on eddy current fields using the finite element method. The reasons why eddy current fields changed with materials and conditions were analyzed and eddy current magnetic intensities in imaging areas were determined. The results showed preliminarily that: (1) for the same frequency, when phase increases from 0°to 90°, eddy current magnetic intensity under static state decreases; (2) the dynamic eddy curent magnetic intensity increases with decreasing distance when actuators does not reach imaging area and reaches a peak value near the margin of imaging area; (3) its internal eddy current magnetic intensity gradually decays when actuator centers into the imaging area and keeps a steady state at the center of imaging area. |
| Key words:
magnetic resonance imaging
eddy current
magnetic resonance-compatibility
computer simulation
actuators
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| 收稿日期: 2014-10-09
修回日期:
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| DOI: |
| 基金项目: 西北工业大学博士论文创新基金(CX201515国)、国家自然科学基金(51105316)、陕西省自然科学基础研究计划(2014JM7280)、西北工业大学基础研究项目(JCY20130118)与中央高校基本科研业务费专项资金(3102015JCS05010)资助 |
| 通讯作者:
Email： |
| 作者简介: 张鹏(1987—),西北工业大学博士研究生,主要从事磁共振兼容性研究。
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