SMASH navigators
SMASH navigators
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DOI：
10.1002/mrm.10388
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发表时间：
2003-03-01
影响因子：
3.3
通讯作者：
Hajnal, JV
中科院分区：
文献类型：
--
作者：
Bydder, M;Atkinson, D;Hajnal, JV
使用多个接收器线圈时采集的附加数据通常用于提高SNR或减少采集时间。它还可以用于通过选择性地替换损坏的数据来去除图像伪影。在本研究中，提出了一种基于空间谐波（SMASH）同步采集的校正方案，该方案能够检测和校正由2D平移引起的运动伪影。新测量的数据进行比较，从先前测量的数据预测，使负和正的空间谐波。将差异归因于在采集单独的相位编码线之间的间隔中发生的运动，并且确定校正参数。考虑两种类型的刚体运动：1）对象和线圈阵列移动，以及2）对象仅移动，因为每种类型在k空间中引起不同的相位误差。仿真，幻影，志愿者实验证明了该技术的有效性。(C)2003 Wiley-Liss，Inc.
The additional data acquired when using multiple receiver coils is commonly used to improve SNR or reduce acquisition times. It may also be used to remove image artifacts by selectively replacing corrupt data. In the present study, a correction scheme is presented based on simultaneous acquisition of spatial harmonics (SMASH) that enables detection and correction of motion artifacts caused by 2D translations. Newly measured data is compared with predictions from previously measured data by making negative and positive spatial harmonics. Differences are attributed to motion occurring in the interval between the acquisition of separate phase encode lines and correction parameters are determined. Two types of rigid body motion are considered: 1) object and coil array move, and 2) object only moves, since each causes different phase errors in k-space. Simulation, phantom, and volunteer experiments demonstrate the validity of the technique. (C) 2003 Wiley-Liss, Inc.