Phase and amplitude correction for multi-echo water-fat separation with bipolar acquisitions.
Phase and amplitude correction for multi-echo water-fat separation with bipolar acquisitions.
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DOI：
10.1002/jmri.22111
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发表时间：
2010-05
影响因子：
4.4
通讯作者：
Brittain, Jean H.
中科院分区：
文献类型：
--
作者：
Yu, Huanzhou;Shimakawa, Ann;McKenzie, Charles A.;Lu, Wenmiao;Reeder, Scott B.;Hinks, R. Scott;Brittain, Jean H.
关键词：
为了通过“双极”采集解决多点水脂分离的相位和幅度误差，该采集可在一次重复中有效地收集具有交替读出梯度极性的所有回波。通过双极采集，涡流和其他系统非理想性可能会引起回波之间不一致的相位误差，从而破坏水脂分离。先前的研究已经解决了读出方向的相位校正。然而，双极采集可能会受到空间高阶相位误差以及读出方向上的幅度调制的影响。介绍了一种校正二维相位和幅度误差的方法。收集具有反向梯度极性的低分辨率参考数据。根据以相反梯度极性收集的一对低分辨率数据，估计并校正二维相位误差。然后将这对数据组合起来进行水脂肪分离。我们证明所提出的方法可以有效地消除体模和体内实验（包括倾斜扫描）的高阶误差。对于双极多回波采集，可以通过使用所提出的方法消除高阶相位误差来实现均匀的水脂分离。
To address phase and amplitude errors for multi-point water–fat separation with “bipolar” acquisitions, which efficiently collect all echoes with alternating read-out gradient polarities in one repetition. With the bipolar acquisitions, eddy currents and other system nonidealities can induce inconsistent phase errors between echoes, disrupting water–fat separation. Previous studies have addressed phase correction in the read-out direction. However, the bipolar acquisitions may be subject to spatially high order phase errors as well as an amplitude modulation in the read-out direction. A method to correct for the 2D phase and amplitude errors is introduced. Low resolution reference data with reversed gradient polarities are collected. From the pair of low-resolution data collected with opposite gradient polarities, the two-dimensional phase errors are estimated and corrected. The pair of data are then combined for water–fat separation. We demonstrate that the proposed method can effectively remove the high order errors with phantom and in vivo experiments, including obliquely oriented scans. For bipolar multi-echo acquisitions, uniform water–fat separation can be achieved by removing high order phase errors with the proposed method.
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