一种基于片上系统的MRI射频脉冲发生器

An MRI radio frequency pulse generator based on on-chip system

该文设计了一种适用于高场的MRI射频脉冲发生系统。该系统利用Xilinx公司的片上处理器(System on Chip, SoC)架构下的FPGA-Zynq 7010与上位机通信获取射频脉冲配置参数,并通过SPI通讯协议来配置多通道的直接数字式频率合成器(Direct Digital Synthesizer, DDS),最后通过FPGA对射频开关的控制输出射频脉冲。该设计使用Vivado软件对片上系统进行设计与开发,并利用DDS实现了射频脉冲的调制,减小了开发难度,降低了硬件的复杂程度。经过实验测试,验证了数字射频脉冲发生功能的有效性。

In this paper, an MRI RF pulse generation system suitable for high field is designed. Zynq 7010, a FPGA based on the System on Chip(SoC) architecture of Xilinx Company, communicates with the upper computer to obtain RF pulse configuration parameters.After that, through SPI communication protocol, multi-channel Direct Digital Synthesizer(DDS) is configured. Finally, using FPGA control of the RF switch, RF pulse is outputted. The research uses Vivado software to design and develop the on-chip system, and uses DDS to realize the modulation of RF pulse. The difficulty of development and the complexity of the hardware are respectively reduced. The effectiveness of digital RF pulse generation is verified by the experiment in the paper.