基于磁共振成像的体发射线圈的研究与设计
发布时间：2019-05-12 10:45
【摘要】：磁共振成像技术已经成为医学临床诊断和研究的重要工具之一，具有非侵入性、无电离、无辐射等特点，其中的射频线圈是成像系统的一个重要元件，对成像质量有着举足轻重的作用，直接影响图像信噪比。 磁共振成像系统通过射频线圈发射电磁波对人体组织进行激发，人体组织中产生共振信号，被接收线圈接收，然后送入计算机系统进行成像。所以射频线圈在磁共振成像系统中起着很关键的作用。为了获得高质量的磁共振扫描图像，要求发射线圈产生的B1场有良好的均匀性，接收线圈具有较高的信噪比。 由于鸟笼线圈中心可以产生比较均匀的磁场，所以在实际应用中，我们一般都采用鸟笼线圈作为发射线圈。鸟笼线圈有高通，低通，带通之分，考虑到实际操作的便捷性，我们一般采用高通鸟笼线圈作体发射线圈。 本文将对高通体发射线圈进行研究与设计，文章首先介绍了核磁共振的产生和原理，核磁共振成像扫描仪的基本结构，然后分析了射频线圈的原理和设计要求，，在此基础上介绍了体发射线圈，并对其进行了理论分析和研究，提出了几种测量线圈Q值的方法，分析了16legs的高通体发射线圈，并对此提出了一种简便快捷添加集总元件的方法，然后在理论分析的基础上将其应用到磁共振成像中，即将此体线圈与成像系统集成，在3T的系统里进行了人体试验，证明此线圈在系统里有比较好的成像结果。
[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.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R445.2
本文编号：2475324
[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.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R445.2
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