开放式MRI永磁型主磁体的匀场方法  

Shimming Method for Open MRI Permanent Main Magnet

作　　者：任自艳[1] 谢德馨[1] 李会香[1] 

机构地区：[1]沈阳工业大学电气工程学院,沈阳110870

出　　处：《电工技术学报》2010年第3期1-5,共5页Transactions of China Electrotechnical Society

基　　金：教育部高等学校博士学科点专项科研基金资助项目(20050142003)

摘　　要：以开放式永磁型MRI(magnetic resonance imaging)主磁体为研究对象,将人工的匀场过程与整数线性规划理论相结合,提出了基于中心磁场参照的匀场方法。建立无源匀场数学模型,并采用Lingo软件进行求解,引入数值分析方法计算小磁片阵列的影响值。数值分析及现场匀场实验均验证了该匀场方法可将成像区磁场的均匀度提高近50%。A new shimming method, which is used for open permanent main magnet for MRI, referred to the central magnetic field is proposed in this paper. The procedure of practical shimming and theory of integer linear programming are integrated into the method. The shimming mathematic model is built and solved by Lingo. The impact of small shim array is computed by numerical analyze method. The homogeneity of imaging region is eventually advanced nearly by 50% through numerical analyze and shimming experiment.

关 键 词：磁共振成像 整数线性规划 无源匀场 中心磁场 匀场实验 

分 类 号：TM154[电气工程—电工理论与新技术]