北京生物医学工程

磁共振射频线圈谐振电路性能评价与仿真分析

Performance evaluation and simulation analysis of resonant circuit of magnetic resonance RF coil

作者：黄清明郑刚

单位：上海理工大学光电信息与计算机工程学院（上海 200093）上海健康医学院医学影像学院（上海 201318）上海市分子影像重点实验室（上海 201318）上海理工大学医学影像工程研究所（上海 200093）

分类号：R318.04；R445.2

出版年·卷·期（页码）：2020·39·5（491-498）

摘要：

目的磁共振成像系统（magnetic resonance imaging，MRI）的射频线圈具有发射和接收双重功能，射频线圈的性能指标直接影响到MRI设备的性能。本文拟对射频线圈的谐振电路性能进行研究，使射频线圈在发射射频和接收信号状态下效率最佳。方法射频线圈的谐振角频率、阻抗匹配、品质因数、接收带宽、发射效率和接收效率等性能参数是实现上述目的的关键因素，本文对射频线圈的串联谐振、并联谐振和串并联谐振电路中影响射频线圈性能参数的相应技术参数进行理论分析推导，并采用电子设计自动化软件（electronics design automation，EDA）和射频仿真软件（radio frequency simulation，RF SIM）对射频线圈电路的谐振状态、信噪比、接收带宽、品质因数和阻抗匹配等参数进行实验验证。结果通过仿真软件能够直观地反应影响射频线圈性能与对应谐振电路技术参数的关系，为射频线圈的设计和性能优化提供了技术依据。结论该方法对射频线圈的设计和性能的改善具有指导意义和工程实用价值，提高了工作效率，节约了射频线圈设计制造成本。

Objective The radio frequency (RF) coil of magnetic resonance imaging (MRI) system has dual functions of transmitting and receiving. The performance of RF coil directly affects the performance of MRI equipment. In this paper, the performance of the resonant circuit of the RF coil is studied, so that the efficiency of the RF coil in transmitting and receiving signals is the best. Methods The performance parameters of RF coil, such as resonant angle frequency, impedance matching, quality factor, receiving bandwidth, transmitting efficiency and receiving efficiency, are the key factors to achieve the above objectives. In this paper, the corresponding technical parameters affecting the coil performance parameters in series resonance, parallel resonance and series-parallel resonance circuits of RF coils are theoretically analyzed and deduced. The resonant state, SNR, receiving bandwidth, quality factor and impedance matching of the RF coil circuit are experimentally validated by electronic design automation (EDA) software and RF simulation (RF SIM) software. Results The simulation software can intuitively reflect the relationship between the performance of the RF coil and the technical parameters of the corresponding resonant circuit, which provides a technical basis for the design and performance optimization of the RF coil. Conclusions This method has guiding significance and practical engineering value for the design and performance improvement of RF coils, improves work efficiency and saves the cost of design and manufacture of RF coils.

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