High-Power Radio Frequency Amplifier for 5-T MRI Whole-Body Scanner

IF 5.6 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Instrumentation and Measurement Pub Date : 2025-06-10 DOI:10.1109/TIM.2025.3575994

Jifeng Chen;Xu Chu;Zhenhua Shen;Bin Liu;Bin Cao;Hui Zhu;Xiaoliang Zhang;Xin Liu;Qiaoyan Chen;Ye Li;Hairong Zheng

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引用次数: 0

Abstract

Magnetic resonance imaging (MRI) at ultrahigh field (UHF) requires radio frequency power amplifiers (RFPAs) with high power capability for whole-body imaging. Insufficient radio frequency (RF) power restricts the peak transmit magnetic field (

${B} _{1}^{+}$

) strength, thereby impeding the ability to achieve sufficient high flip angles for body imaging. This study presents an RFPA that can achieve a peak power capability of 64 kW, the highest reported value for UHF MRI systems. A novel impedance matching circuit design method was proposed to optimize the power capability of each RF transistor. The designed RFPA features an innovative transmit architecture that accommodates various applications by configuring independent transmit channels in eight-channel, four-channel, or two-channel modes. High gain linearity of 0.2 dB/3.6°, 0.3 dB/5.2°, and 0.2dB/4° was achieved across different operating modes. The

${B} _{1}^{+}$

maps and body images acquired using a 5 T whole-body MRI scanner demonstrated that sufficient flip-angles for whole body imaging can be achieved with the proposed RFPA. The body images also exhibited good uniformity in contrast.

查看原文本刊更多论文

用于5-T MRI全身扫描仪的大功率射频放大器

超高场（UHF）磁共振成像（MRI）需要具有高功率全身成像能力的射频功率放大器（rfpa）。射频（RF）功率不足限制了峰值发射磁场（${B} _{1}^{+}$）强度，从而阻碍了实现足够高的翻转角度的能力。本研究提出了一种RFPA，可以实现64千瓦的峰值功率能力，这是UHF MRI系统的最高报道值。提出了一种新的阻抗匹配电路设计方法，以优化射频晶体管的功率性能。设计的RFPA具有创新的传输架构，可通过配置8通道、4通道或2通道模式的独立传输通道来适应各种应用。在不同的工作模式下实现了0.2dB/ 3.6°、0.3 dB/5.2°和0.2dB/4°的高增益线性。使用5t全身MRI扫描仪获得的${B} _{1}^{+}$地图和身体图像表明，使用所提出的RFPA可以获得足够的全身成像翻转角度。身体图像在对比度上也表现出良好的均匀性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Instrumentation and Measurement 工程技术-工程：电子与电气

CiteScore

9.00

自引率

23.20%

发文量

1294

审稿时长

3.9 months

期刊介绍： Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications. The scope of these papers may encompass: (1) theory, methodology, and practice of measurement; (2) design, development and evaluation of instrumentation and measurement systems and components used in generating, acquiring, conditioning and processing signals; (3) analysis, representation, display, and preservation of the information obtained from a set of measurements; and (4) scientific and technical support to establishment and maintenance of technical standards in the field of Instrumentation and Measurement.