Mendes Jason, Kholmovski Eugene, Parker Dennis L
Utah Center for Advanced Imaging Research, University of Utah, Salt Lake City, Utah 84108, USA.
Magn Reson Med. 2009 Mar;61(3):739-47. doi: 10.1002/mrm.21883.
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.
本文回顾了利用相位相关性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链。结果表明，当对同一回波链进行两次采集时，下采样相关性会提供一系列狄拉克函数，据此可测量两次回波链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也能找到类似的相关性。通过测量k空间子组的所有相邻对之间的运动，可以确定受试者的完整运动历史，并校正图像中的运动伪影。利用涡轮自旋回波头部和手部图像研究了使用该技术的一些限制因素。
