化学交换饱和转移MRI中B0场不均匀性校正的研究进展  

Research progresses of inhomogeneity correction with B0 field in chemical exchange saturation transfer MRI

作　　者：薛心雨 侯榆青[1] 贺小伟[1] 白帅[1] 

机构地区：[1]西北大学信息科学与技术学院,陕西西安710127

出　　处：《中国医学影像技术》2016年第8期1285-1289,共5页Chinese Journal of Medical Imaging Technology

基　　金：国家自然科学基金(61372046)

摘　　要：化学交换饱和转移(CEST)MRI数据采集过程中主磁场B0的不均匀部分会导致空间编码错误,扭曲CEST成像,产生伪影并严重影响定量分析的准确性,因此需要对MRI进行匀场校正。近年来,研究者对B0场不均匀性的校正问题进行了一系列研究,通过优化线性拟合算法、改进采集序列等手段,可以在一定程度上降低B0场不均匀性带来的伪影,减少扫描时间并且提高对比噪声比。本文旨在对B0场不均匀性校正的研究进行综述。The inhomogeneity of B0 field in the process of data collection in chemical exchange saturation transfer （CEST） MRI could cause the spatial encoding error and distort CEST imaging. Also it could produce artifacts and seriously affect the accuracy of quantitative analysis. So inhomogeneity correction of MRI were needed. In recent years, some re- searchers made a series of studies on the problem about the inhomogeneity correction of B0 field. By using the linear fitting algorithm, improving acquisition sequence and so on, the artifacts caused by inhomogeneity of B0 filed could be reduced. Also the scanning time and the contrast to noise ratio could be improved. The research progress in correction of inhomoge- neity B0 field was reviewed in this paper.

关 键 词：化学交换饱和转移 磁共振成像 伪影 B0场不均匀性 对比噪声比 

分 类 号：R445.2[医药卫生—影像医学与核医学]