MR图像伪影与K-空间数据关系的研究

Study on the relationship between artifacts of MR image and its K-space data

目的研究MRI图像和K-空间数据之间的映射关系以及因K-空间数据有问题而引起的典型的图像伪影。方法给出K-空间及K-平面的定义,通过MRI模拟实验揭示K-空间数据的不同区域所包含的信息的差异。结果给出了K-空间数据丢失或欠采样所引起的各种伪影的特征。结论MR图像与K-空间数据之间满足傅立叶映射关系,了解K-空间的性质对于理解图像伪影产生的根源、校正图像畸变和伪影直接对k-空间数据进行处理有时候更方便、更有效。

Objective To research the mapping relationship between MR image and its K-space data as well as some typical artifacts caused by error K-space data.Methods The definition of K-space and K-plane is given.Through MRI simulation experiments the difference of information in different regions of K-space data is revealed.Results Some aliasing artifacts caused by under-sampling K-space data are illustrated.The features of different artifacts caused by K-space data loss or under-sampling are presented.Conclusion It...