摘要
磁共振成像理论研究中,Bloch方程常用来求解自旋核的动力学行为.对于流动质子情况磁共振信号的描述则可以利用流动Bloch方程.本文在具体的物理模型中,利用Bloch流动方程,分析了血液的流速及不同的射频场条件下,磁共振信号的变化.结果显示,相同条件下,质子流速较快时会减弱信号,而在非线性的射频场条件下,磁共振信号会减弱.理解不同条件下磁共振信号的变化,对于磁共振成像技术的研究和改进提供了理论参考.
Bloch equation is used to solve the dynamics behavior of nucleus in magnetic field, and the physics mechanisms of blood flow can be described by Bloch flow equation. We discussed the influence of MR(Magnetic Resonance) signal under specified conditions with different parameters such as blood flow velocity and RF(Radio Frequency) field. It showed that high velocity and nonlinear RF filed will weaken the signal. Understanding change of MR signal under a variety of conditions will help to better develop MRI(Magnetic Resonance Imaging) technique and provide theoretical reference for MRI.
出处
《湖南理工学院学报(自然科学版)》
CAS
2016年第2期58-61,共4页
Journal of Hunan Institute of Science and Technology(Natural Sciences)
作者简介
苏晋(1980-),男,山西长治人,硕士,长治医学院基础医学院讲师.主要研究方向:理论物理,医学影像物理