Influence of anisotropic compartments on magnetic field and electric potential distributions generated by artificial current dipoles inside a torso phantom
Influence of anisotropic compartments on magnetic field and electric potential distributions generated by artificial current dipoles inside a torso phantom
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DOI：
10.1088/0031-9155/53/1/017
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发表时间：
2008-01-07
影响因子：
3.5
通讯作者：
Haueisen, Jens
中科院分区：
文献类型：
--
作者：
Liehr, Mario;Haueisen, Jens
本研究的目的是分析各向异性电导率对磁场和电势的影响，通过体模测量。将人工旋转电流偶极子放置在充满盐水溶液的躯干体模中各向异性绞纱排列的中间。研究了各向异性体导电引起的信号强度以及电位和场图形状的变化。将偶极子的不同方向与测量场和电势的相应方向（角度差）进行比较。对于电和磁数据，观察到的信号方向和真正的偶极子方向之间的角度差不断增加的偶极子和各向异性之间的角度（高达80度），然后减少到零，在他们的正交方向。随着偶极和各向异性之间的角度的增加，这两个信号强度降低约10%。虽然磁场显示出一般较强的形状变化，但电势的变化形状显示出与扩展源的相似性。我们的幻影研究表明，各向异性隔间的影响方向，幅度和形状的潜力和领域在不同程度上。我们的结论是，各向异性结构应考虑体积导体建模，源的方向，延伸和强度的兴趣。
The purpose of this study is the analysis of the influence of anisotropic conductivity on magnetic fields and electric potentials by means of phantom measurements. An artificial rotating current dipole was placed in the middle of an anisotropic skein arrangement in a torso phantom filled with saline solution. The signal strength and the change of the shape of potential and field patterns due to anisotropic volume conduction were investigated. Different directions of the dipole were compared to corresponding orientations of measured fields and potentials (angle difference). For electric and magnetic data, the angle difference between observed signal orientations and true dipole orientations continuously increased with the angle between dipole and anisotropy (up to 80 degrees) and then decreased back to zero at their orthogonal orientation. Both signal strengths decreased about 10% with an increasing angle between dipole and anisotropy. While the magnetic field showed a generally stronger shape change, the changed shape of the electric potential showed similarity to an extended source. Our phantom study demonstrated that anisotropic compartments influence directions, amplitudes and shapes of potentials and fields at different degrees. We concluded that anisotropic structures should be considered in volume conductor modelling, when source orientation, extension and strength are of interest.