Deign of MRI System Communication Module and Pulse Sequence Generation Module Based on FPGA

磁共振成像具有成像参数多、对比度高、对人体安全无损害等优点，磁共振成像如今发展成为当今世界医学诊断中最广泛以及最先进的影像技术之一。 在磁共振成像系统中，主控板是整个MRI仪器的中枢核心，主要包括通信模块和脉冲序列生成模块。其中，通信模块实现了与计算机的数据通信和数据存储；脉冲序列生成模块实现了指令的解析和脉冲序列的生成。本文围绕通信模块以及脉冲序列生成模块进行详细讨论和设计。 本文主要工作内容如下： 第一，针对磁共振成像系统中主控板的设计，提出了采用纯硬件的方式对脉冲序列生成模块进行设计的方案，对作为主控板的FPGA开发板进行选型。对开发板进行相关的硬件模块设计以及用SOPCBuild...MRI has many advantage such as many imaging parameters, high contrast, more safe and no damage to human body, MRI become one of the most widly used and most advanced in medical diagnosis in today’s world. Main control board is the central core of the MRI system. It includes communication module and pulse sequence module. The communication module realizes the data communication with computer and d...学位：工程硕士院系专业：物理科学与技术学院_工程硕士(电子与通信工程)学号：3312013115284

Design of 0.5T magnetic resonance imaging console based on SOPC

针对磁共振成像仪控制台的数字化、小型化发展趋势,设计了一种0.5T磁共振关节成像仪控制台的总体框架。以FPGA的SOPC(System On the Programmable Chip)系统为仪器控制核心,开发了数字化磁共振成像仪控制台部分,将网络传输、数据处理、射频脉冲及梯度波形产生、外设驱动等各个功能集成在单一FPGA芯片中。实现上位机对输出波形,数字调制解调,梯度涡流补偿,抽取滤波等功能的控制。通过各个模块测试,系统功能稳定、脉冲波形可定制,为小型化磁共振成像仪的控制台研制提供了一种可靠性高而灵活的设计方案。Aiming at the development of the digitalization and miniaturization of the MRI system console,the basic structure and work flow of console for the 0.5T MRI were introduced.The consde is designed based on highly integrated SOPC system of FPGA,network communication,data processing,waveform generating is realized and peripherals in signal FPGA is controlled.Realization of tuning the wave,modulation &demodulation,gradient eddy current compensation,decimation and multiple filtering by PC.Finally the system are tested,results show that the system has the merits of high reliability,flexible pulse sequences,providing a compact and flexible scheme for MRI console.国家自然科学基金(11175149)资助项

Design of MRI communications and pulse generation module

针对小型化核磁共振成像仪主控板的功能需要提出新的设计方式,采用FPGA开发板作为主控板,以Nios II嵌入式软核作为协处理器,通过在其上移植μC/OS-Ⅱ操作系统及lwIP协议栈,实现与计算机的网络通信;使用Verilog硬件描述语言编写脉冲序列生成模块,实现对指令的解析以及执行,形成用户要求的脉冲序列。最终测试结果表明,主控板的通信速率以及通过示波器采集得到的脉冲序列均满足成像仪系统要求。而且这种软硬结合的设计方式与以往全软件的设计相比,使成像仪精度更高,性能更加稳定。To satisfy the require of the MRI main control board,this paper puts forwards a new design which uses FPGA development board as main control board and uses Nios II as a co-processor.We transplant theμC/OS-II operating system and protocol stack lwIP to achieve the network communication with computers.Then we use the hardware language Verilog to write pulse sequence generation module to achieve the analysis and execution of the command.Eventually it produces user's pulse sequence.Final test results show that the communication rate of the main control board and pulse sequence which is obtained by oscilloscope can satisfy the requirements of the MRI system.Compared with the past of the whole software design,this design make the MRI system higher precision and more stable.国家自然科学基金(11175149)资助项