便携式磁共振多源射频脉冲发生器设计
收稿日期: 2024-11-11
网络出版日期: 2024-12-20
基金资助
国家自然科学基金资助项目(61101174);上海介入医疗器械工程技术研究中心资助项目(18DZ2250900)
Design of a Portable Magnetic Resonance Multi-source RF Pulse Generator
Received date: 2024-11-11
Online published: 2024-12-20
在磁共振成像（Magnetic Resonance Imaging，MRI）领域，多源发射技术能够改善射频磁场均匀性，提高MRI图像质量. 本文提出了一种基于Zynq 7000 SoC全可编程片上系统的便携式磁共振多源射频脉冲发生器的设计. 该设计包含具有脉冲序列参数完全开放的上位机软件，以及一个全数字化、集成度高、双信用卡大小的硬件电路板，从而并行输出多路波形、频率、相位和幅度独立可调节的射频脉冲信号. 利用硬件描述语言Verilog在现场可编程门阵列（Field Programmable Gate Array，FPGA）内部构建高级可扩展接口的直接数字频率合成器（Advanced eXtensible Interface Direct Digital Synthesizer，AXI DDS）和乘法器等硬件电路，实现产生多路射频脉冲信号及信号调制的功能. 实验结果证明，该设计能正确发射四路MRI射频脉冲信号，为便携式磁共振多源射频脉冲发生器的设计提供一种全数字化、可重构性强、结构紧凑的可行方案.
刘颖 , 袁斌华 , 章浩伟 . 便携式磁共振多源射频脉冲发生器设计[J]. 波谱学杂志, 2025 , 42(3) : 285 -298 . DOI: 10.11938/cjmr20243137
In the field of magnetic resonance imaging (MRI), multi-source emission can improve the uniformity of radio frequency (RF) magnetic field and the quality of MRI images. In this paper, we propose a portable MRI multi-source RF pulse generator design based on the Zynq 7000 SoC all programmable system-on-chip. The design consists of a host computer software with fully open pulse sequence parameters and a fully digitalized, highly integrated, dual credit card-sized hardware board, which outputs multiple RF pulse signals with independently adjustable waveform, frequency, phase, and amplitude in parallel. The hardware description language Verilog is used to build AXI DDS (advanced eXtensible interface direct digital synthesizer) and multiplier circuits inside the FPGA (field programmable gate array) to realize the functions of generating multiple RF pulse signals and signal modulation. The experimental results show that the design can correctly transmit four MRI RF pulse signals, providing a fully digital, reconfigurable, compact, and feasible solution for developing a portable magnetic resonance multi-source RF pulse generator.
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