基于System Generator的多源MRI数字化射频发射方法  

Multi-source MRI Digital Radio Frequency Emission Method Based on System Generator

作　　者：刘颖[1] 钟凯 章浩伟[1] 刘意 LIU Ying;ZHONG Kai;ZHANG Haowei;LIU Yi(Institute of Medical Imaging Engineering,School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学健康科学与工程学院医学影像工程研究所,上海200093

出　　处：《生物医学工程学进展》2023年第3期253-259,共7页Progress in Biomedical Engineering

基　　金：国家自然科学基金资助(61101174)。

摘　　要：该文将多通道并行发射技术与数字调制技术应用于磁共振成像(MRI)射频信号发射,提出了一种多源MRI数字化射频发射方法。该射频发射方法通过现场可编程门阵列(FPGA)实现直接数字式频率合成(DDS),由FPGA内部存储器存储射频脉冲波形,并以正交混频的方法进行数字上变频(DUC)。该方法更加简便易操作,提高了集成度与灵活性,应用多速率信号处理技术提高了数据率变化的灵活性;应用Xilinx公司的数字信号处理(DSP)开发工具System Generator进行设计开发,降低了数字化开发难度。该设计验证了多源数字化射频发射的功能,测试结果证明了该发射方法的有效性。This study designs a multi-source MRI digital radio frequency transmission method by applying multi-channel parallel transmission technology and digital modulation technology to magnetic resonance imaging(MRI)radio frequency signal transmission.This radio frequency method realizes direct digital frequency synthesis(DDS)through FPGA,stores the radio frequency pulse waveform in the internal memory of FPGA,and performs digital up-conversion(DUC)by means of quadrature mixing.This method is simple and easy to operate,improves the integration and flexibility,and applies multi-rate signal processing technology to improve the flexibility of data rate changes.In addition,it uses the Xilinx’s digital signal processing(DSP)development tool System Generator for design and development,reducing the difficulty of digital development.The design verifies the function of multi-source digital radio frequency transmission,and the simulation and test results prove the effectiveness of the transmission method.

关 键 词：多源发射 数字上变频 磁共振信号 多速率信号处理 

分 类 号：O482.53[理学—固体物理]