Multi-coil magnetic field modeling.
Multi-coil magnetic field modeling.
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DOI：
10.1016/j.jmr.2013.08.015
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发表时间：
2013-11
影响因子：
2.2
通讯作者：
de Graaf, Robin A.
中科院分区：
文献类型：
--
作者：
Juchem, Christoph;Green, Dan;de Graaf, Robin A.
将多线圈(MC)磁场建模的性能与用于产生球谐(SH)形状的专用导线图案进行了比较，因为它们是MR成像和光谱分析中空间编码和磁场均一化的主要工具。为此，分析并证明了一个示例48通道MC设置能够在与MR研究相关的小的和大的感兴趣区域上生成所有的一阶到四阶SH形状。产生线性梯度场的MC效率与经典和最先进的SH梯度线圈具有相同的数量级。随着需要组合多个SH项的更复杂的场形状的合成，MC场建模逐渐变得更有效。讨论了用MC方法对磁场形状和发电性能进行区域优化的可能性，重点讨论了场精度和发电效率之间可能的权衡。此前已有证据表明，MC垫片的表现优于当前的SH垫片。除了此处所示的MC垫片的效率提升之外，MC概念还具有以下潜力：1)取代基于专用SH线圈组的传统垫片系统；2)实现类似于对象特定RF线圈的最佳对象特定垫片解决方案。
The performance of multi-coil (MC) magnetic field modeling is compared to dedicated wire patterns for the generation of spherical harmonic (SH) shapes as these are the workhorse for spatial encoding and magnetic field homogenization in MR imaging and spectroscopy. To this end, an example 48 channel MC setup is analyzed and shown to be capable of generating all first through fourth order SH shapes over small and large regions-of-interest relevant for MR investigations. The MC efficiency for the generation of linear gradient fields shares the same order of magnitude with classic and state-of-the-art SH gradient coils. MC field modeling becomes progressively more efficient with the synthesis of more complex field shapes that require the combination of multiple SH terms. The possibility of a region-specific optimization of both magnetic field shapes and generation performance with the MC approach are discussed with emphasis on the possible trade-off between the field accuracy and generation efficiency. MC shimming has been shown previously to outperform current SH shimming. Along with the efficiency gains of MC shimming shown here, the MC concept has the potential to 1) replace conventional shim systems that are based on sets of dedicated SH coils and 2) allow optimal object-specific shim solutions similar to object-specific RF coils.
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影响因子：
2.2
作者：
Van Landeghem, Maxime;Danieli, Ernesto;Casanova, Federico
通讯作者：
Casanova, Federico
影响因子：
3.3
作者：
GRUETTER, R
通讯作者：
GRUETTER, R
DOI：
10.1016/j.jmr.2010.03.008
发表时间：
2010-06
期刊：
Journal of magnetic resonance (San Diego, Calif. : 1997)
影响因子：
--
作者：
Juchem C;Nixon TW;McIntyre S;Rothman DL;de Graaf RA
通讯作者：
de Graaf RA
DOI：
10.1002/cmr.b.20091
发表时间：
2007-08-01
影响因子：
0.9
作者：
Poole, Michael;Bowtell, Richard
通讯作者：
Bowtell, Richard
影响因子：
3.3
作者：
Juchem, Christoph;Brown, Peter B.;de Graaf, Robin A.
通讯作者：
de Graaf, Robin A.