Motion correction properties of the shells k-space trajectory
Motion correction properties of the shells k-space trajectory
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DOI：
10.1016/j.mri.2005.10.038
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发表时间：
2006-07-01
影响因子：
2.5
通讯作者：
Bernstein, Matt A.
中科院分区：
文献类型：
--
作者：
Shu, Yunhong;Elliott, Andrew M.;Bernstein, Matt A.
一个k空间轨迹的可行性，一组3D壳上的采样数据证明与幻影和志愿者实验。一个交错的多镜头的细节。螺旋脉冲序列和网格重建算法，使用Voronoi图提供。描述了炮弹k空间弹道的运动修正特性。它示出，当与三个点标记结合使用时，与壳轨迹获得的k-空间数据提供了一个概括的RINGLET方法，允许校正任意刚体运动与六个自由度。不需要使用专用导航回波或k空间数据的冗余采集。回顾性运动校正证明与控制的幻影实验和7个健康的人类志愿者。运动校正被示出以改善图像。定性地和定量地使用从图像熵计算的度量。讨论了炮弹弹道的优点和挑战。特别关注收购效率（C）2006 Elsevier Inc. All rights reserved.
The feasibility of a k-space trajectory that samples data on a set of 3D shells is demonstrated with phantom and volunteer experiments. Details of an interleaved multi-shot. helical spiral Pulse sequence and a gridding reconstruction algorithm that uses Voronoi diagrams are provided. The motion-correction properties of the shells k-space trajectory are described. It is shown that when used in conjunction with three point markers, k-space data acquired with the shells trajectory provide a generalization of the RINGLET method, allowing for correction of arbitrary rigid-body motion with six degrees of freedom. Use of dedicated navigator echoes or redundant acquisitions of k-space data are not required. Retrospective motion correction is demonstrated with controlled phantom experiments and with seven healthy human Volunteers. The motion correction is shown to improve the images. both qualitatively and quantitatively with a metric calculated from image entropy. Advantages and challenges of the shells trajectory are discussed. with particular attention to acquisition efficiency (C) 2006 Elsevier Inc. All rights reserved.