Phase-encode reordering to minimize errors caused by motion
Phase-encode reordering to minimize errors caused by motion
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DOI：
10.1002/mrm.1910350318
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发表时间：
1996-03-01
影响因子：
3.3
通讯作者：
Wood, ML
中科院分区：
文献类型：
--
作者：
Macgowan, CK;Wood, ML
开发了一种通过重新排序k空间采集来抑制MR图像中运动影响的新方法。现有的重新排序方法遭受图像模糊，这里提出的方法特别适用于沿着相位编码方向的平移，在这种情况下，它减少了重影和模糊。该方法在概念上类似于k空间的线性相移，除了它具有不会无意中破坏固定结构的优点。该方法适用于沿着相位编码方向发生大量平移运动的解剖部位，例如肝脏和肾脏的头尾运动。重新排序方法的动机来自对影响运动伪影严重程度的因素的分析。重新排序方法背后的理论进行了描述和实验验证，通过成像移动的幻影。
A new method for suppressing the effects of motion in MR images by reordering the acquisition of k space has been developed. Existing reordering methods suffer from image blurring, The method presented here applies specifically to translation along the phase-encoding direction, in which case it reduces both ghosting and blurring. The method is conceptually similar to a linear phase shift of k space, except that it has the advantage of not corrupting stationary structures inadvertently. The method is intended for anatomic sites in which substantial translational motion occurs along the phase-encoding direction, such as the cranial-caudal motion of the liver and kidneys, The reordering method is motivated from an analysis of factors affecting the severity of motion artifacts. The theory behind the reordering method is described and validated experimentally by imaging a moving phantom.