Multi-reception strategy with improved SNR for multichannel MR imaging.
Multi-reception strategy with improved SNR for multichannel MR imaging.
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DOI：
10.1371/journal.pone.0042237
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Wu B;Li Y;Wang C;Vigneron DB;Zhang X
为了提高接收通道有限的超高场磁共振系统的成像性能，提出了一种扩展GRAPPA的多接收策略。在这种方法中，线圈元件根据适当的分组标准被分成两组或更多组。首先按顺序启用这些组以进行成像，然后执行并行采集以补偿由多个接收引起的冗余扫描时间。为了有效地重建从每组元素获得的数据，开发了一种特定的扩展GRAPPA。该方法是通过在7特斯拉全身磁共振扫描仪上使用16元头阵列进行评估的，该扫描仪具有8个接收通道。体内实验表明，在相同的扫描时间下，接收两次、加速比为2的16元阵列与8元阵列相比，在脑部边缘区域获得了显著的信噪比增益，而在中心区域保持了几乎相同的信噪比，这表明在接收通道有限的情况下，所提出的多接收策略和扩展GRAPPA对于改善MRI系统的图像质量是可行的。这项研究还表明，如果采用适当的捕获策略，对于具有N个接收器通道的MR系统来说，使用具有多于N个单元的线圈阵列是有利的。
A multi-reception strategy with extended GRAPPA is proposed in this work to improve MR imaging performance at ultra-high field MR systems with limited receiver channels. In this method, coil elements are separated to two or more groups under appropriate grouping criteria. Those groups are enabled in sequence for imaging first, and then parallel acquisition is performed to compensate for the redundant scan time caused by the multiple receptions. To efficiently reconstruct the data acquired from elements of each group, a specific extended GRAPPA was developed. This approach was evaluated by using a 16-element head array on a 7 Tesla whole-body MRI scanner with 8 receive channels. The in-vivo experiments demonstrate that with the same scan time, the 16-element array with twice receptions and acceleration rate of 2 can achieve significant SNR gain in the periphery area of the brain and keep nearly the same SNR in the center area over an eight-element array, which indicates the proposed multi-reception strategy and extended GRAPPA are feasible to improve image quality for MRI systems with limited receive channels. This study also suggests that it is advantageous for a MR system with N receiver channels to utilize a coil array with more than N elements if an appropriate acquisition strategy is applied.
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