基于多核DSP的磁共振成像数据处理电路设计

发布时间：2018-03-06 03:11

本文选题：并行磁共振　切入点：多核DSP　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：磁共振成像作为一种无电离辐射的非介入性成像技术在医疗诊断领域有着非常广泛的应用。当前磁共振成像的主要研究方向为基于多通道接收的并行磁共振成像技术,该技术可以缩短成像时间,或利用相同的成像时间提升图像质量。本文设计了一种用于并行磁共振成像技术的数据处理电路,该电路利用多核DSP强大的计算能力加速多通道图像的重建,并通过对采样信号的直接处理提升图像信噪比。本文在研究了并行磁共振成像数据接收和多通道重建算法的基础上,针对现有磁共振成像谱仪计算能力的不足,提出了多核DSP+FPGA的磁共振成像数据处理电路设计方案。该方案利用多核DSP在谱仪内部对多通道采集数据进行实时重建,在提升图像信噪比的同时降低了图像的重建时间。根据该方案详细设计了数据处理电路的各个模块,然后在数据处理电路板上分别对外部DDR3存储、SRIO和千兆以太网等外设进行了测试。软件设计部分,针对多核DSP的结构,深入研究了多核DSP的程序并行设计方法；选用了二维快速傅里叶变换+SoS合成算法作为多通道图像重建算法,并根据多核DSP的特性对该算法进行了多种优化,根据程序并行设计方法对重建算法进行了重新设计,最后将并行设计后的重建算法在数据处理板的4个DSP核上进行了验证。实验结果表明,多核DSP作为磁共振成像数据处理核心可以大大缩短并行磁共振系统中图像重建的时间,基于多核DSP的磁共振成像数据处理电路满足实验现有谱仪的升级需求,且能够实现并行磁共振成像系统中多通道数据的实时重建。
[Abstract]:As a non-ionizing radiation non-interventional imaging technique, magnetic resonance imaging has been widely used in the field of medical diagnosis. At present, the main research direction of magnetic resonance imaging is parallel magnetic resonance imaging based on multi-channel reception. This technique can shorten the imaging time or improve the image quality with the same imaging time. In this paper, a data processing circuit for parallel magnetic resonance imaging is designed. The circuit uses the powerful computing power of multi-core DSP to speed up the reconstruction of multi-channel images, and improves the signal-to-noise ratio of images by direct processing of sampled signals. In this paper, we study the parallel magnetic resonance imaging data reception and multi-channel reconstruction algorithms. Aiming at the deficiency of the existing Mr spectrometer, a design scheme of magnetic resonance imaging data processing circuit for multi-core DSP FPGA is proposed, which uses multi-core DSP to reconstruct the multi-channel data in real time. The signal to noise ratio (SNR) of the image is raised and the reconstruction time of the image is reduced. According to this scheme, the modules of the data processing circuit are designed in detail. Then the external DDR3 storage devices such as SRIO and Gigabit Ethernet are tested on the data processing circuit board respectively. In the part of software design, the parallel programming method of multi-core DSP is deeply studied in view of the structure of multi-core DSP. The 2-D Fast Fourier transform (SoS) synthesis algorithm is selected as the multi-channel image reconstruction algorithm. The algorithm is optimized according to the characteristics of multi-core DSP, and the reconstruction algorithm is redesigned according to the parallel programming method. Finally, the parallel designed reconstruction algorithm is verified on the four DSP cores of the data processing board. The experimental results show that the multi-core DSP as the core of MRI data processing can greatly shorten the time of image reconstruction in the parallel magnetic resonance system. The magnetic resonance imaging data processing circuit based on multi-core DSP can meet the need of upgrading the existing spectrometer and realize the real-time reconstruction of multi-channel data in parallel magnetic resonance imaging system.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R445.2;TP274.2

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