Elimination of artifacts in short echo time 1H MR spectroscopy of the frontal lobe
Elimination of artifacts in short echo time 1H MR spectroscopy of the frontal lobe
复制标题
消除额叶短回波时间 1H 磁共振波谱中的伪影
DOI：
--
复制
发表时间：
1996
影响因子：
3.3
通讯作者：
Linda Chang
中科院分区：
文献类型：
--
作者：
T. Ernst;Linda Chang
来自人脑额部的局部化的1H谱经常被“幽灵”伪影扭曲，特别是在回波时间较短的按压序列中。这些伪影是由鼻窦和口腔中涉及磁化的不必要相干的不充分去相引起的。因为压制序列的各种不需要的相干是不同地去相的，所以切片梯度的顺序对光谱质量有显著的影响。对于正面体素，必须在轴向上应用最后一个切片渐变。有了这个切片顺序，主要代谢物可以被量化，个体间变异约为10%。
Localized 1H spectra from the frontal part of the human brain are often distorted by “ghost” artifacts, especially with short echo time PRESS sequences. These artifacts are caused by insufficient dephasing of unwanted coherences involving magnetization in the sinuses and the mouth. Because the various unwanted coherences of a PRESS sequence are dephased differently, the order of the slice gradients has a pronounced effect on the spectral quality. For frontal voxels, the last slice gradient has to be applied in the axial direction. With this slice order, the major metabolites can be quantified with an interindividual variability of about 10%.
正电子发射断层扫描在痴呆症临床评估中的应用。
影响因子：
4.9
作者：
Mazziotta,JC;Frackowiak,RS;Phelps,ME
通讯作者：
Phelps,ME