發(fā)布時(shí)間：2018-04-14 00:12

  本文選題：IVUS + 成像系統(tǒng)��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著醫(yī)學(xué)影像技術(shù)的飛速發(fā)展，心血管病變的成像診斷技術(shù)不斷成熟。其主要的診斷方式為X射線冠狀動(dòng)脈造影和血管內(nèi)超聲(IVUS)。冠狀動(dòng)脈造影只能夠檢查管腔而血管內(nèi)超聲還能提供粥樣斑塊的組織信息，便于醫(yī)生對(duì)血管病變做出全面和準(zhǔn)確的評(píng)價(jià)。 本文重點(diǎn)研究了IVUS成像系統(tǒng)的機(jī)械控制裝置和數(shù)字掃描變換技術(shù)，主要工作如下： (1)設(shè)計(jì)了血管內(nèi)超聲成像系統(tǒng)的機(jī)械控制裝置的結(jié)構(gòu)，分析了裝置的組成和意義。通過硬件對(duì)裝置傳遞的超聲回波信號(hào)進(jìn)行噪聲評(píng)估，并利用FPGA控制裝置中的編碼器進(jìn)行旋轉(zhuǎn)位置檢測。 (2)重點(diǎn)研究了數(shù)字掃描變換技術(shù)中動(dòng)態(tài)濾波和坐標(biāo)轉(zhuǎn)換的原理、設(shè)計(jì)和實(shí)現(xiàn)。首先，利用MATLAB獲取濾波器參數(shù)，在此基礎(chǔ)上，利用分布式算法實(shí)現(xiàn)了基于FPGA的FIR帶通濾波器。然后，介紹了坐標(biāo)轉(zhuǎn)換的必要性，重點(diǎn)分析了CORDIC算法和查找表法原理，基于CORDIC算法利用FPGA芯片進(jìn)行仿真，完成了整個(gè)坐標(biāo)轉(zhuǎn)換的硬件邏輯設(shè)計(jì)，利用圓插補(bǔ)法進(jìn)行漏點(diǎn)插補(bǔ)，，實(shí)現(xiàn)了從一維回波信號(hào)到二維數(shù)字圓形掃描圖像的成像過程仿真。 (3)介紹了IVUS成像系統(tǒng)的實(shí)驗(yàn)平臺(tái)，搭建了以FPGA為核心的硬件控制系統(tǒng)并進(jìn)行實(shí)驗(yàn)得到實(shí)時(shí)的血管壁圖像數(shù)據(jù)。實(shí)驗(yàn)結(jié)果表明：最終采集圖像的分辨率為1000×1024、幀頻1Hz，圖像從輸入到輸出僅1s的延時(shí)，能在保證圖像質(zhì)量的基礎(chǔ)上滿足系統(tǒng)實(shí)時(shí)性的要求，驗(yàn)證了設(shè)計(jì)的可行性和正確性。
[Abstract]:With the rapid development of medical imaging technology, the imaging diagnosis of cardiovascular disease has been matured.The main diagnostic methods were X-ray coronary angiography and intravascular ultrasound.Coronary angiography can only examine the lumen and intravascular ultrasound can provide tissue information of atherosclerotic plaques and facilitate doctors to make a comprehensive and accurate evaluation of vascular lesions.This paper focuses on the mechanical control device and digital scanning conversion technology of IVUS imaging system. The main work is as follows:1) the structure of mechanical control device of intravascular ultrasound imaging system is designed, and the composition and significance of the device are analyzed.The ultrasonic echo signal transmitted by the device is evaluated by hardware, and the rotary position is detected by the encoder in the FPGA control device.The principle, design and implementation of dynamic filtering and coordinate transformation in digital scanning transform technology are studied.Firstly, the filter parameters are obtained by MATLAB, and then the FIR bandpass filter based on FPGA is implemented by distributed algorithm.Then, the necessity of coordinate transformation is introduced, and the principle of CORDIC algorithm and lookup table method is analyzed. Based on CORDIC algorithm, the hardware logic design of coordinate transformation is completed by using FPGA chip, and the interpolation of leak point is carried out by circle interpolation method.The imaging process from one-dimensional echo signal to two-dimensional digital circular scanning image is simulated.The experimental platform of IVUS imaging system is introduced. The hardware control system based on FPGA is built and the real time image data of vascular wall are obtained by experiments.The experimental results show that the resolution of the acquired image is 1000 脳 1024, the frame rate is 1Hz, and the delay of the image from input to output is only 1s, which can meet the real-time requirements of the system on the basis of guaranteeing the image quality, and verifies the feasibility and correctness of the design.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP391.41;R445.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李俊峽,鷹津良樹,宮本忠司,永井康三,加藤貴雄,中島康弘;冠脈病變中血管內(nèi)超聲與冠脈造影的比較[J];第四軍醫(yī)大學(xué)學(xué)報(bào);2005年13期

2 趙蔚 ,石光明 ,黃宇星;基于CPLD的數(shù)字掃描變換器[J];電子工程師;2001年12期

3 郭繼昌,李香萍,滕建輔;基于位串行分布式算法和FPGA實(shí)現(xiàn)FIR電路的研究[J];電子測量與儀器學(xué)報(bào);2001年02期

4 肖衛(wèi)初,陳偉宏;MATLAB在IIR濾波器的設(shè)計(jì)與仿真中的應(yīng)用[J];湖南工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2005年01期

5 王紹徐;;基于FPGA的坐標(biāo)轉(zhuǎn)換及實(shí)現(xiàn)[J];上海電力學(xué)院學(xué)報(bào);2012年04期

6 陳曉冬;張紅旭;周佩t

本文編號(hào)：1746844