传播子矩阵方法推导IR-EPI序列下的磁共振信号  

Derivation of the Signal of IR-EPI Sequences in MRI Using the Propagator Matrix

作　　者：苏晋 牛晓东 袁小燕 Su Jin;Niu Xiao-dong;Yuan Xiao-yan(Department of Basic Medicine,Changzhi Medical College,Changzhi 046000, Chin)

机构地区：[1]长治医学院基础医学部,山西长治046000

出　　处：《广东工业大学学报》2018年第1期6-8,28,共4页Journal of Guangdong University of Technology

基　　金：长治医学院2016年校级教学改革创新项目(J2016013)

摘　　要：医学磁共振成像(Magnetic Resonance Imaging,MRI)中,对特定序列下磁共振信号的理论研究,有助于分析影响成像质量的因素以及提高成像质量.Bloch方程是磁共振成像理论研究中的动力学方程.传播子矩阵方法是将Bloch方程矩阵化,将主磁场、外加射频场等各种条件参数通过矩阵的形式作用于磁化强度矢量的向量形式,通过对IR-EPI序列下的不同时间段的传播子矩阵的计算,得到最终的磁共振信号的表达式.此方法为MRI技术中复杂序列下的信号分析提供了理论基础.The theoretical study of the signal in certain sequences is helpful to analyze the factors that affect the imaging quality and improve the imaging quality in magnetic resonance imaging. Bloch equation is one of the most universal methods to solve the dynamics behavior of nucleus in magnetic field. Bloch equation and its solutions can be written in matrix form. By acting on magnetization （the Vector M）,the propagator matrix that contains some parameters,such as main magnetic field,Radio Frequency pulse （ RF）,relaxation time, can be used to calculate signal of magnetic resonance imaging （ MRI） in different circumstances of MRI sequences.

关 键 词：磁共振成像 BLOCH方程 传播子矩阵 IR-EPI序列 

分 类 号：O571.2[理学—粒子物理与原子核物理]