An eight-channel, nonoverlapping phased array coil with capacitive decoupling for parallel MRI at 3 T
An eight-channel, nonoverlapping phased array coil with capacitive decoupling for parallel MRI at 3 T
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DOI：
10.1002/cmr.b.20078
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发表时间：
2007-02-01
影响因子：
0.9
通讯作者：
Vigneron, Daniel B.
中科院分区：
文献类型：
--
作者：
Von Morze, Cornelius;Tropp, James;Vigneron, Daniel B.
设计了一个8通道、非重叠相控阵线圈，用于在3 T下对大脑和髋关节进行常规和并行成像。根据SENSE重建模拟中g因子热点的减少以及较小线圈元件预期的较高外围信噪比（SNR）预测，选择非重叠设计是基于减少的并行重建噪声膨胀。通过电路仿真建模的电容桥接技术，将最近邻居之间的串扰降低到可管理的水平。电容去耦技术足够有效，允许使用标准系统前置放大器操作线圈。线圈被证明是有用的几个传统的和并行的成像应用。在EPI-SENSE弥散加权成像的重要结构中，证明了SNR优于商用八通道头部线圈。高分辨率MRSI（0.22 cc）产生的SNR高达21的NAA峰在皮质灰质。该线圈还提供了极好的四倍加速GRAPPA髋关节图像。(C)2007 Wiley Periodicals，Inc.
An eight-channel, nonoverlapping phased array coil was designed for conventional and parallel imaging of the brain and the hip at 3T. The nonoverlapping design was selected on the basis of reduced parallel reconstruction noise inflation, as predicted by the diminution of g-factor hotspots in SENSE reconstruction simulations, and the higher peripheral signal-to-noise ratio (SNR) expected from smaller coil elements. A capacitive bridging technique, modeled by a circuit simulation, reduced the crosstalk between nearest neighbors to a manageable level. The capacitive decoupling technique was effective enough to allow the coil to be operated using standard system preamplifiers. The coil was shown to be useful for several conventional and parallel imaging applications. SNR improvements over a commercial eight-channel head coil were demonstrated in important structures in EPI-SENSE diffusion-weighted imaging. High-resolution MRSI (0.22 cc) yielded SNR of up to 21 for the NAA peak in the cortical gray matter. The coil also provided excellent fourfold accelerated GRAPPA images of the hip. (C) 2007 Wiley Periodicals, Inc.