Rigid-body motion correction with self-navigation MRI.
Rigid-body motion correction with self-navigation MRI.
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DOI：
10.1002/mrm.21883
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发表时间：
2009-03
影响因子：
3.3
通讯作者：
Parker DL
中科院分区：
文献类型：
--
作者：
Mendes J;Kholmovski E;Parker DL
回顾了利用相位相关检测刚体平移运动的方法，并将其应用于涡轮自旋回波数据采集中的单个回波序列。结果表明，当相同的回波序列被采集两次时，二次采样相关提供了一组增量函数，由此可以测量两个回波序列采集之间发生的运动。进一步表明，在k-空间中相邻的两组等间距测量之间可以找到类似的相关性。通过测量所有相邻的k空间子群对之间的运动，可以确定对象的完整运动历史，并且可以校正图像中的运动伪影。使用Turbo自旋回波头和手部图像研究了使用该技术的一些限制因素。
The use of phase correlation to detect rigid-body translational motion is reviewed and applied to individual echotrains in turbo-spin-echo data acquisition. It is shown that when the same echotrain is acquired twice, the subsampled correlation provides an array of delta-functions, from which the motion that occurred between the acquisitions of the two echotrains can be measured. It is shown further that a similar correlation can be found between two sets of equally spaced measurements that are adjacent in k-space. By measuring the motion between all adjacent pairs of k-space subgroups, the complete motion history of a subject can be determined and the motion artifacts in the image can be corrected. Some of the limiting factors in using this technique are investigated with turbo-spin-echo head and hand images.