多通道线圈去耦技术及其在新型术中磁共振射频接收线圈的应用  

Decoupling of Multi-channel RF Coil and Its Application in the Intraoperative MRI

作　　者：辛学刚[1] 韩继钧[1] 冯衍秋[1] 陈武凡[1] 

机构地区：[1]南方医科大学生物医学工程学院,广州510515

出　　处：《生物医学工程学杂志》2011年第2期223-227,共5页Journal of Biomedical Engineering

基　　金：国家重点基础研究发展规划基金资助项目(2010CB732500);国家自然科学基金重点项目资助(30730036)

摘　　要：在多通道磁共振射频线圈设计过程中,回路之间的耦合会使射频线圈发生共振频率分裂及偏移,从而降低线圈的性能,因此对于多通道线圈,去耦技术在其设计过程中至关重要。此外,线圈回路的空间排列不同,将导致回路间的耦合类型及程度不同,故所采用的去耦方法也将不同。本文应对超声聚能热消融手术的临床需求,提出一新型多通道射频线圈,该线圈是与超声聚能设备相结合的术中磁共振系统重要组成部分。针对该射频线圈,本文提出了去耦电路的设计方法,并通过实测相关参数来验证该去耦电路的设计,最后通过人体盆腔成像实验说明所设计线圈的去耦效果。The coupling from different elements of the multi-channel coil leads to the splitting of the resonance frequency and deviation from the Lamor frequency.Decoupling between different elements is the key technology in the design of the radiofrequency（RF） coil.The electrical decoupling circuits should vary with different arrangements of the elements.A novel method of decoupling for the RF coil used in the intraoperative MR-guided focused ultrasound system is reported in the paper.The prototype RF coil was made according to the proposed decoupling method.The bench test of the prototype showed that the performance of the decoupling of the coil was excellent.The images in vivo were acquired with the designed prototype RF coil.

关 键 词：磁共振成像 射频线圈 去耦合 术中 

分 类 号：R318.0[医药卫生—生物医学工程]