Virtual Coil Concept for Improved Parallel MRI Employing Conjugate Symmetric Signals
Virtual Coil Concept for Improved Parallel MRI Employing Conjugate Symmetric Signals
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DOI：
10.1002/mrm.21652
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发表时间：
2009-01-01
影响因子：
3.3
通讯作者：
Griswold, Mark A.
中科院分区：
文献类型：
--
作者：
Blaimer, Martin;Gutberlet, Marcel;Griswold, Mark A.
提出了一种利用共轭k空间对称性来提高并行MRI性能的新方法。通过从实际线圈生成包含共轭对称k空间信号的虚拟线圈，可以将附加的图像和线圈相位信息合并到用于并行采集技术的重建过程中。这样，重建条件得到了改善，导致了较少的噪声增强。特别是与广义自动校准部分并行采集(GRAPPA)相结合，虚拟线圈的概念代表了一种实用的方法，因为不需要显式的空间相位信息。此外，还研究了复杂接收线圈以及背景对相位变化的影响。结果表明，存在背景相位分布，从而产生优化的pMRI重建。Magn Reson Med 61：93-102,2009。(C)2009年Wiley-Liss，Inc.
A new approach for utilizing conjugate k-space symmetry for improved parallel MRI performance is presented. By generating virtual coils containing conjugate symmetric k-space signals from actual coils, additional image- and coil-phase information can be incorporated into the reconstruction process for parallel acquisition techniques. In that way the reconstruction conditions are improved, resulting in less noise enhancement. In particular in combination with generalized autocalibrating partially parallel acquisitions (GRAPPA), the virtual coil concept represents a practical approach since no explicit spatial phase information is required. In addition, the influence of phase variations originating from the complex receiver coils as well as from the background is investigated. It is shown that there exist background phase distributions yielding an optimized pMRI reconstruction. Magn Reson Med 61:93-102, 2009. (C) 2009 Wiley-Liss, Inc.