基于SerialLite II协议的磁共振成像数据传输系统设计

doi:10.11938/cjmr20223012

摘要/Abstract

摘要：

为了提高磁共振成像信号的信噪比、减少信号传输中的干扰，一种主流的技术方案是将信号采集装置置于屏蔽室，靠近接收线圈．针对该方案，本文提出了基于SerialLite II协议的光纤数据传输方案，以解决信号采集的参数配置和回波数据的高速传输问题．电路以现场可编程门阵列（Field Programmable Gate Array，FPGA）器件和小型可插拔（Small Form Pluggable，SFP）光纤模块为核心，基于SerialLite II协议实现信号采集的配置参数的下传与回波数据的上传．为了便于编程，在FPGA中构建NIOS II软核处理器，以完成信号采集模块参数的发送、接收和配置．本文还研制了实验样机，进行了大量的数据传输测试，结果表明本方案能够实现高速的数据传输，64 K字节的数据通过30 m光纤传输所需的时间仅约为364.2 μs，并且具有可靠、延时低的特点．

关键词: 磁共振成像, 数据传输, SerialLite II协议, NIOS II处理器, 光纤

Abstract:

In order to improve the signal-to-noise ratio of magnetic resonance imaging signal acquisition and reduce the interference in signal transmission, the popular technical solution is to place the signal acquisition device in a shielded room, close to the receiving coil. In response to the previous scheme, this paper proposed an optical fiber data transmission scheme based on SerialLite II protocol to solve the problem of parameter configuration of signal acquisition and high-speed transmission of echo data. The circuit takes field programmable gate array (FPGA) device and small form pluggable (SFP) optical fiber module as the core of new instrument and realizes the download of configuration parameters of signal acquisition and the upload of echo data based on SerialLite II protocol. In order to facilitate programming, a NIOS II soft-core processor is constructed in FPGA to complete the sending, receiving and configuration of the parameters of the signal acquisition module. An experimental prototype was developed, and data transmission was tested. The results showed that this scheme can achieve high-speed data transmission. It takes only about 364.2 μs to transmit 64 K bytes of data through a 30-meter optical fiber. The scheme is reliable and has low-delay.

Key words: magnetic resonance imaging, data transmission, SerialLite II protocol, NIOS II processor, optical fiber

中图分类号:

O482.53

张天宁,雷展智,肖亮. 基于SerialLite II协议的磁共振成像数据传输系统设计[J]. 波谱学杂志, 2023, 40(2): 179-191.

ZHANG Tianning,LEI Zhanzhi,XIAO Liang. Design of a Data Transmission System for Magnetic Resonance Imaging Based on SerialLite II Protocol[J]. Chinese Journal of Magnetic Resonance, 2023, 40(2): 179-191.

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单个通道采集点数	平均所需时间/μs	标准差/μs
256	23.42	0.010854
512	45.82	0.010981
1024	91.16	0.010334
2048	182.4	0.011059
4096	364.2	0.010483