1.5T超导磁共振励磁过程中防止失超的研究与设计-毕业论文.doc

泰山医学院本科毕业设计（论文） PAGE PAGE 8 泰山医学院本科毕业设计（论文） 1.5T超导磁共振励磁过程中防止失超的研究与设计 摘 要 超导型核磁共振成像设备，简称超导磁共振，是目前主要的医学成像设备之一，其所呈现的医学图像具有高清晰度，高精细度，高分辨率，高对比度以及信息量大等优点。超导磁共振在结构上主要分为主磁体系统，梯度系统，射频接收与发射系统，计算机控制系统以及其他相关辅助系统。本论文主要以主磁体系统中主磁体的励磁原理与过程为主，系统的讲述了超导磁共振在励磁过程中防止失超现象发生方面的研究与设计。 励磁过程对于每台超导磁共振设备来说都是必须要经历的一个过程，正是由于他的发生才能使主磁体产生我们期望的磁场强度或是中心频率，进而为后期的医学图像的产生打下基础。 失超现象的防止对于每个超导磁共振生产厂家来讲都是非常重视的，尤其是在实际的励磁过程中，失超现象的发生不仅威胁到人身的健康，还会对生产厂家的产品质量信誉造成不可逆变的影响。 关键词：超导磁共振；励磁过程；失超现象 Abstract Superconductive Nuclear Magnetic Resonance Image Equipment, shorting for superconductive MRI, is one of the modern main imaging equipments. As a major medical imaging method, magnetic resonance imaging has the advantages of generating clear, precise images with high resolution and contrast ratio as well as massive information. The MRI can be divided into five components, which is the main magnet system, the gradient system, the RF transmitting receiving system, the computer-controlling system and other related assisting system. In this paper, we make the ramping-up basic theories and procedures of the magnet system to be our main discussion contents, especially the research and the related design of quenching-proof details in the practice ramping-up procedure. The ramping-up procedure is a very important experience to the superconductive MRI. With the existence of this procedure, we can get the main magnet strength or the middle frequency we expect, which is the basis of a medical image coming out for practice use. The preventing to the quenching phenomenon is so important to a superconductive MRI manufacture, especially in the practice ramping-up procedures, the emergency of quenching will not only threat the health of the related person, but will make a bad fluency on the product quality reputation for the superconductive MRI manufacture. Keywords: superconductive MRI, ramping-up procedure, the quenching phenomenon  目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc328336533 第一章 绪论 PAGEREF _Toc328336533 \h 1 HYPER