波谱学杂志 ›› 2012, Vol. 29 ›› Issue (3): 354-360.

• 磁共振谱仪研制技术进展专栏 • 上一篇    下一篇

一种用于开放式MRI的射频发射线圈设计

魏树峰1,2,杨文晖1*,郭丽慧1,2,王慧贤1   

  1. 1. 中国科学院 电工研究所,北京 100190;2. 中国科学院 研究生院,北京 100049
  • 收稿日期:2012-01-09 修回日期:2012-02-24 出版日期:2012-09-05 发布日期:2012-09-05
  • 基金资助:

    国家自然科学基金青年科学基金资助项目(50807050).

A RF Transmit Coil Designed for Open Magnetic Resonance Imaging

 WEI Shu-Feng1,2, YANG Wen-Hui1*, GUO Li-Hui1,2, WANG Hui-Xian1   

  1. 1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;   
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-01-09 Revised:2012-02-24 Online:2012-09-05 Published:2012-09-05
  • Supported by:

    国家自然科学基金青年科学基金资助项目(50807050).

摘要:

介绍了一种用于开放式MRI系统的射频发射线圈. 此发射线圈为上下2个相同的线圈,分别安装在磁体的2极,两线圈采用非对称的正交方式放置. 线圈为矩形螺线管结构,通过电磁场数值计算的方法对线圈的匝间距进行了优化,使线圈在300 mm的球形区域内达到偏差不超过3 dB的均匀性要求. 根据优化结果制作了一套用于0.23 T开放式MRI系统的发射线圈,并对线圈的均匀性及射频发射的效率进行了测试. 测试结果表明,线圈具有较高的发射效率和较好的均匀性,由此验证了设计方案的可行性.

关键词: 磁共振成像(MRI), 射频发射线圈, 垂直场, 电磁场数值计算

Abstract:

The design of a radiofrequency (RF) transmit coil for open magnetic resonance imaging (MRI) was introduced. The transmit coil is consisted of two rectangular solenoid coils with the same size which are installed on the two poles of the magnet in orthogonal directions. The two coils are positioned. A transmit coil used for 0.23 T open MRI was made. Numerical simulation of electromagnetic fields was used to optimize the distance of the turns in the coils. The homogeneity and power efficiency of the coil were measured experimentally. The deviation of the amplitude of the RF field in a sphere of 300 mm in diameter was measured to be less than 3 dB.

Key words: MRI, RF transmit coil, vertical field, numerical simulation of electromagnetic fields

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