本文關(guān)鍵詞： 磁共振成像 相控陣線圈 信號傳輸 互擾　出處：《華東師范大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：核磁共振成像技術(shù)(Magnetic Resonance Imaging, MRI)自1973年誕生以來,由于它具有無損傷性檢測、圖像對比度高等特點,被廣泛應(yīng)用于生物、醫(yī)學(xué)、勘探等多個領(lǐng)域中,而近年來相控陣和并行成像技術(shù)的快速發(fā)展更是進(jìn)一步提升了MRI在上述領(lǐng)域中的實用性。 對于MRI系統(tǒng)的布局,由于受到MRI系統(tǒng)周圍強(qiáng)磁場環(huán)境的限制,接收機(jī)必須遠(yuǎn)離MRI系統(tǒng)的磁體部分。在較早的并行成像技術(shù)中,接收機(jī)與相控陣線圈之間信號的傳輸采用多條電纜來實現(xiàn)。但在實際應(yīng)用中,電纜之間信號的互擾以及電磁環(huán)境對電纜的耦合等因素會導(dǎo)致圖像質(zhì)量下降。針對這一問題已有多種解決方法被提出,主要可分為光纖傳輸方案和無線傳輸方案。這些方法雖然解決了各通道間的互擾問題,但仍有其自身的缺點。其一,相對于磁共振信號,光纖和無線技術(shù)的動態(tài)范圍過小,這將會造成信號波形的扭曲;其二,實現(xiàn)時操作技術(shù)復(fù)雜且成本較高。 本文主要工作是研制一種有線調(diào)頻傳輸方法,此方法能有效地抑制了信號傳輸時各通道間信號的互擾,同時最大限度地減少了電磁環(huán)境與電纜的耦合。本論文主要內(nèi)容如下： 第一部分：簡要介紹核磁共振成像發(fā)展及現(xiàn)狀、相控陣線圈及并行成像技術(shù)。 第二部分：簡要介紹目前解決MRI成像時各通道間信號互擾問題的方法以及其各自存在的問題。 第三部分：主要介紹本文提出的用于解決互擾問題的有線調(diào)頻傳輸方法及其實現(xiàn),并給出電路測試結(jié)果 第四部分：主要介紹為驗證有線調(diào)頻傳輸方法而研制的三通道相控陣線圈,并給出線圈的測試結(jié)果。 第五部分：給出成像實驗結(jié)果及其分析。
[Abstract]:Magnetic Resonance Imaging (MRI) has been widely used in many fields, such as biology, medicine, exploration and so on, since it was born in 1973. In recent years, the rapid development of phased array and parallel imaging technology has further improved the practicability of MRI in these fields. For the layout of MRI system, due to the restriction of the strong magnetic field surrounding the MRI system, the receiver must be far from the magnet part of the MRI system. The signal transmission between the receiver and the phased array coil is realized by multiple cables. However, in practical application, The interference of signals between cables and the coupling of the electromagnetic environment to the cable will lead to the deterioration of image quality. Many methods have been proposed to solve this problem. These methods can be divided into optical fiber transmission schemes and wireless transmission schemes. Although these methods solve the problem of mutual interference between channels, they still have their own disadvantages. First, compared with magnetic resonance signals, the dynamic range of optical fiber and wireless technology is too small. This will cause distortion of the signal waveform. Second, the operation technology is complex and the cost is high. The main work of this paper is to develop a wired FM transmission method, which can effectively suppress the signal interference between the channels and minimize the coupling between the electromagnetic environment and the cable. The main contents of this thesis are as follows:. The first part: the development and present situation of nuclear magnetic resonance imaging, phased array coil and parallel imaging technology. In the second part, the methods to solve the problem of signal interferences between channels in MRI imaging and their respective problems are briefly introduced. The third part: this paper mainly introduces the cable frequency modulation transmission method and its implementation to solve the problem of mutual disturbance, and gives the circuit test results. Part 4th: the three-channel phased array coil developed to verify the wired FM transmission method is introduced, and the test results of the coil are given. Part 5th: the experimental results and their analysis are given.
【學(xué)位授予單位】：華東師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：R318.6

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相關(guān)期刊論文 前1條

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本文編號：1542630