【摘要】 介绍了为 0 .2 T开放式永磁型医用核磁共振成像仪所研制的有源匀场系统的基本结构、工作原理和匀场方法 ,并在最后给出了该 MRI通过自旋回波成像方式产生的一组影像 (T1加权和 T2加权 )以展示该系统良好的匀场性能。更多还原

【Abstract】 This paper introduces the basic structure,operation principle as well as shimming method of an active shimming system ,which was developed for 0.2T open style permanent magnet MRI. In the end, a group of spin echo images(T1 weighted and T2 weighted) produced by the 0.2T MRI are given to demonstrate the satisfactory shimming performance of this active shimming system.更多还原