Fast automatic linear off-resonance correction method for spiral imaging
Fast automatic linear off-resonance correction method for spiral imaging
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DOI：
10.1002/mrm.20973
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发表时间：
2006-08-01
影响因子：
3.3
通讯作者：
Meyer, Craig H.
中科院分区：
文献类型：
--
作者：
Chen, Weitian;Meyer, Craig H.
场的不均匀性和磁化率的变化，再加上长的读出时间，会导致螺旋成像中的图像模糊。在文献中已经提出了许多基于先验非共振信息（诸如所获取的场图）的校正方法。自动非共振校正方法是从图像数据本身估计场图的替代方法。在本文中，我们提出了一种快速的自动非共振校正方法，执行线性校正，而无需获取现场地图。该方法只需要大约两倍的总计算时间相比，通过网格图像重建。它还可以与全场地图自动非共振校正方法结合使用，以增加校正的程度。该方法通过在体冠状动脉成像来证明。
Field inhomogeneity and susceptibility variations, coupled with a long readout, can result in image blurring in spiral imaging. Many correction methods based on a priori off-resonance information, such as an acquired field map, have been proposed in the literature. Automatic off-resonance correction methods are alternative approaches that estimate a field map from the image data themselves. In this paper we propose a fast automatic off-resonance correction method that performs linear correction without acquiring a field map. The method requires only about two times the total computation time compared to image reconstruction by gridding. It can also be used in combination with a full field map automatic off-resonance correction method to increase the extent of correction. The method is demonstrated by in vivo coronary artery imaging.