CAJ | 학술논문

目的：设计实现一个基于布洛赫(Bloch)方程的磁共振成像模拟器，并以此仿真主磁场不均匀对成像的影响。材料与方法用C语言实现磁共振成像(magnetic resonance imaging，MRI)模拟器。成像过程中，虚拟物体各体素点的磁化强度矢量根据离散化Bloch方程递推计算得出。假定主磁场B0的不均匀性的几种模式，设定不均匀与其空间位置的关系，以此为代入条件进行模拟成像实验，并将结果与相应的实际成像对比。结果本MRI模拟器可以较好地模拟出主磁场不均匀对成像造成的影响，得到符合预期的成像结果。结论本MRI模拟器有助于工程与科研中分析主磁场不均匀对成像的影响。
목적：설계실현일개기우포락혁(Bloch)방정적자공진성상모의기，병이차방진주자장불균균대성상적영향。재료여방법용C어언실현자공진성상(magnetic resonance imaging，MRI)모의기。성상과정중，허의물체각체소점적자화강도시량근거리산화Bloch방정체추계산득출。가정주자장B0적불균균성적궤충모식，설정불균균여기공간위치적관계，이차위대입조건진행모의성상실험，병장결과여상응적실제성상대비。결과본MRI모의기가이교호지모의출주자장불균균대성상조성적영향，득도부합예기적성상결과。결론본MRI모의기유조우공정여과연중분석주자장불균균대성상적영향。
Objective: The purpose of this paper is to design a magnetic resonance imaging simulator based-on Bloch equation, which can be used to simulate the impact of the main field inhomogeneity to the virtual magnetic resonance imaging (MRI). Materials and Methods:The magnetic resonance imaging simulator is implemented by C language. In the imaging process, the magnetization vector of each voxel in the virtual object is calculated by the discrete time solution of the Bloch equation. It assumes two different models of the main field inhomogeneity and assigns the spatial position matrix of inhomogeneity, which is used as the input of virtual MRI simulation. Compare the simulated images with the corresponding actual experimental images.Results:The MRI simulator allows the simulation of images impacted by the inhomogeneity of the main magnetic field. The imaging results can meet our expectation.Conclusion:The MRI simulator is helpful for engineering and scientiifc research in the analysis of the main magnetic ifeld inhomogeneity effects on imaging.