本文選題：并行磁共振　切入點(diǎn)：多核DSP　出處：《北京化工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：磁共振成像作為一種無電離輻射的非介入性成像技術(shù)在醫(yī)療診斷領(lǐng)域有著非常廣泛的應(yīng)用。當(dāng)前磁共振成像的主要研究方向?yàn)榛诙嗤ǖ澜邮盏牟⑿写殴舱癯上窦夹g(shù),該技術(shù)可以縮短成像時(shí)間,或利用相同的成像時(shí)間提升圖像質(zhì)量。本文設(shè)計(jì)了一種用于并行磁共振成像技術(shù)的數(shù)據(jù)處理電路,該電路利用多核DSP強(qiáng)大的計(jì)算能力加速多通道圖像的重建,并通過對(duì)采樣信號(hào)的直接處理提升圖像信噪比。本文在研究了并行磁共振成像數(shù)據(jù)接收和多通道重建算法的基礎(chǔ)上,針對(duì)現(xiàn)有磁共振成像譜儀計(jì)算能力的不足,提出了多核DSP+FPGA的磁共振成像數(shù)據(jù)處理電路設(shè)計(jì)方案。該方案利用多核DSP在譜儀內(nèi)部對(duì)多通道采集數(shù)據(jù)進(jìn)行實(shí)時(shí)重建,在提升圖像信噪比的同時(shí)降低了圖像的重建時(shí)間。根據(jù)該方案詳細(xì)設(shè)計(jì)了數(shù)據(jù)處理電路的各個(gè)模塊,然后在數(shù)據(jù)處理電路板上分別對(duì)外部DDR3存儲(chǔ)、SRIO和千兆以太網(wǎng)等外設(shè)進(jìn)行了測試。軟件設(shè)計(jì)部分,針對(duì)多核DSP的結(jié)構(gòu),深入研究了多核DSP的程序并行設(shè)計(jì)方法；選用了二維快速傅里葉變換+SoS合成算法作為多通道圖像重建算法,并根據(jù)多核DSP的特性對(duì)該算法進(jìn)行了多種優(yōu)化,根據(jù)程序并行設(shè)計(jì)方法對(duì)重建算法進(jìn)行了重新設(shè)計(jì),最后將并行設(shè)計(jì)后的重建算法在數(shù)據(jù)處理板的4個(gè)DSP核上進(jìn)行了驗(yàn)證。實(shí)驗(yàn)結(jié)果表明,多核DSP作為磁共振成像數(shù)據(jù)處理核心可以大大縮短并行磁共振系統(tǒng)中圖像重建的時(shí)間,基于多核DSP的磁共振成像數(shù)據(jù)處理電路滿足實(shí)驗(yàn)現(xiàn)有譜儀的升級(jí)需求,且能夠?qū)崿F(xiàn)并行磁共振成像系統(tǒng)中多通道數(shù)據(jù)的實(shí)時(shí)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.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：R445.2;TP274.2

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 孫科林;基于多核DSP的實(shí)時(shí)圖像處理平臺(tái)研究[D];電子科技大學(xué);2012年

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本文編號(hào)：1573070