北京生物醫(yī)學(xué)工程

磁共振射頻線圈諧振電路性能評(píng)價(jià)與仿真分析

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

作者：黃清明鄭剛

單位：上海理工大學(xué)光電信息與計(jì)算機(jī)工程學(xué)院（上海 200093）上海健康醫(yī)學(xué)院醫(yī)學(xué)影像學(xué)院（上海 201318）上海市分子影像重點(diǎn)實(shí)驗(yàn)室（上海 201318）上海理工大學(xué)醫(yī)學(xué)影像工程研究所（上海 200093）

關(guān)鍵詞：射頻線圈；諧振電路；性能參數(shù)；發(fā)射；接收

分類號(hào)：R318.04；R445.2

出版年·卷·期（頁碼）：2020·39·5（491-498）

摘要：

目的磁共振成像系統(tǒng)（magnetic resonance imaging，MRI）的射頻線圈具有發(fā)射和接收雙重功能，射頻線圈的性能指標(biāo)直接影響到MRI設(shè)備的性能。本文擬對(duì)射頻線圈的諧振電路性能進(jìn)行研究，使射頻線圈在發(fā)射射頻和接收信號(hào)狀態(tài)下效率最佳。方法射頻線圈的諧振角頻率、阻抗匹配、品質(zhì)因數(shù)、接收帶寬、發(fā)射效率和接收效率等性能參數(shù)是實(shí)現(xiàn)上述目的的關(guān)鍵因素，本文對(duì)射頻線圈的串聯(lián)諧振、并聯(lián)諧振和串并聯(lián)諧振電路中影響射頻線圈性能參數(shù)的相應(yīng)技術(shù)參數(shù)進(jìn)行理論分析推導(dǎo)，并采用電子設(shè)計(jì)自動(dòng)化軟件（electronics design automation，EDA）和射頻仿真軟件（radio frequency simulation，RF SIM）對(duì)射頻線圈電路的諧振狀態(tài)、信噪比、接收帶寬、品質(zhì)因數(shù)和阻抗匹配等參數(shù)進(jìn)行實(shí)驗(yàn)驗(yàn)證。結(jié)果通過仿真軟件能夠直觀地反應(yīng)影響射頻線圈性能與對(duì)應(yīng)諧振電路技術(shù)參數(shù)的關(guān)系，為射頻線圈的設(shè)計(jì)和性能優(yōu)化提供了技術(shù)依據(jù)。結(jié)論該方法對(duì)射頻線圈的設(shè)計(jì)和性能的改善具有指導(dǎo)意義和工程實(shí)用價(jià)值，提高了工作效率，節(jié)約了射頻線圈設(shè)計(jì)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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