【摘要】：磁共振成像技術(shù)已經(jīng)成為醫(yī)學(xué)臨床診斷和研究的重要工具之一，具有非侵入性、無電離、無輻射等特點，其中的射頻線圈是成像系統(tǒng)的一個重要元件，對成像質(zhì)量有著舉足輕重的作用，直接影響圖像信噪比。 磁共振成像系統(tǒng)通過射頻線圈發(fā)射電磁波對人體組織進行激發(fā)，人體組織中產(chǎn)生共振信號，被接收線圈接收，然后送入計算機系統(tǒng)進行成像。所以射頻線圈在磁共振成像系統(tǒng)中起著很關(guān)鍵的作用。為了獲得高質(zhì)量的磁共振掃描圖像，要求發(fā)射線圈產(chǎn)生的B1場有良好的均勻性，接收線圈具有較高的信噪比。 由于鳥籠線圈中心可以產(chǎn)生比較均勻的磁場，所以在實際應(yīng)用中，我們一般都采用鳥籠線圈作為發(fā)射線圈。鳥籠線圈有高通，低通，帶通之分，考慮到實際操作的便捷性，我們一般采用高通鳥籠線圈作體發(fā)射線圈。 本文將對高通體發(fā)射線圈進行研究與設(shè)計，文章首先介紹了核磁共振的產(chǎn)生和原理，核磁共振成像掃描儀的基本結(jié)構(gòu)，然后分析了射頻線圈的原理和設(shè)計要求，，在此基礎(chǔ)上介紹了體發(fā)射線圈，并對其進行了理論分析和研究，提出了幾種測量線圈Q值的方法，分析了16legs的高通體發(fā)射線圈，并對此提出了一種簡便快捷添加集總元件的方法，然后在理論分析的基礎(chǔ)上將其應(yīng)用到磁共振成像中，即將此體線圈與成像系統(tǒng)集成，在3T的系統(tǒng)里進行了人體試驗，證明此線圈在系統(tǒng)里有比較好的成像結(jié)果。
[Abstract]:Magnetic resonance imaging (MRI) technology has become one of the important tools for medical clinical diagnosis and research. it has the characteristics of non-invasive, non-ionizing, no radiation and so on. The RF coil is an important component of the imaging system. It plays an important role in imaging quality and directly affects the signal-to-noise ratio (SNR) of images. Magnetic resonance imaging (MRI) system emits electromagnetic wave from RF coil to excite human tissue. Resonance signal is generated in human tissue, received by receiving coil, and then sent to computer system for imaging. Therefore, RF coils play a key role in magnetic resonance imaging (MRI) system. In order to obtain high quality magnetic resonance scanning image, the B1 field generated by the transmitting coil is required to have good uniformity, and the receiving coil has a high signal-to-noise ratio (SNR). Because the center of birdcage coil can produce more uniform magnetic field, we usually use birdcage coil as emission coil in practical application. Birdcage coils can be divided into high-pass, low-pass and band-pass. Considering the convenience of practical operation, we usually use Qualcomm birdcage coil as body emission coil. In this paper, the high pass volume emission coil will be studied and designed. Firstly, the generation and principle of nuclear magnetic resonance (NMR) and the basic structure of MRI scanner are introduced, and then the principle and design requirements of RF coil are analyzed. On this basis, the bulk emission coil is introduced, and its theoretical analysis and research are carried out. Several methods to measure the Q value of the coil are put forward, and the high-pass bulk emission coil of 16legs is analyzed. A simple and fast method of adding lumped elements is proposed, and then it is applied to magnetic resonance imaging on the basis of theoretical analysis. The body coil is integrated with the imaging system and the human body test is carried out in the 3T system. It is proved that the coil has good imaging results in the system.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：R445.2

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