Limitations of calculating field distributions and magnetic susceptibilities in MRI using a Fourier based method.
Limitations of calculating field distributions and magnetic susceptibilities in MRI using a Fourier based method.
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DOI：
10.1088/0031-9155/54/5/005
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发表时间：
2009-03-07
影响因子：
3.5
通讯作者：
Haacke EM
中科院分区：
文献类型：
--
作者：
Cheng YC;Neelavalli J;Haacke EM
研究了一种基于离散傅里叶的核磁共振场分布和局部磁化率计算方法。仿真结果表明，基于二维和三维离散格林函数的方法比基于连续格林函数的方法误差更小。二维场计算需要对“洛伦兹盘”进行修正，这与三维情况下的洛伦兹球项类似。提出了一种标准最小二乘拟合方法，用于提取MR图像中单个物体的磁化率。仿真和仿真研究证实了离散方法和最小二乘拟合方法的可行性。在未来，这种方法可能会从MR图像中找到大脑局部结构的准确敏感性值。
A discrete Fourier based method for calculating field distributions and local magnetic susceptibility in MRI is carefully studied. Simulations suggest that the method based on discrete Greens functions in both 2D and 3D spaces has less error than the method based on continuous Greens functions. The 2D field calculations require the correction of the “Lorentz disk, which is similar to the Lorentz sphere term in the 3D case. A standard least squares fit is proposed for the extraction of susceptibility for a single object from MR images. Simulations and a phantom study confirm both the discrete method and the feasibility of the least squares fit approach. Finding accurate susceptibility values of local structures in the brain from MR images may be possible with this approach in the future.
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影响因子：
3.3
作者：
Jenkinson, M;Wilson, JL;Jezzard, P
通讯作者：
Jezzard, P
DOI：
10.1002/cmr.b.10083
发表时间：
2003-10-01
影响因子：
0.9
作者：
Salomir, R;De Senneville, BD;Moonen, CTW
通讯作者：
Moonen, CTW
影响因子：
4.4
作者：
Pandian, Daniel S. J.;Ciulla, Carlo;Ayaz, Muhammad
通讯作者：
Ayaz, Muhammad
影响因子：
4.4
作者：
Haacke, E. Mark;Ayaz, Muhammad;Kirsch, Wolff
通讯作者：
Kirsch, Wolff
影响因子：
3.5
作者：
Koch, Kevin M.;Papademetris, Xenophon;de Graaf, Robin A.
通讯作者：
de Graaf, Robin A.