Vortex Shaped Current Sources in a Physical Torso Phantom
Vortex Shaped Current Sources in a Physical Torso Phantom
复制标题
物理躯干模型中的涡流形电流源
DOI：
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发表时间：
2005
影响因子：
3.8
通讯作者：
T. Katila
中科院分区：
文献类型：
--
作者：
M. Liehr;J. Haueisen;M. Goernig;P. Seidel;J. Nenonen;T. Katila
最近的研究报道了人类心磁图和心电图中的差异信息。涡电流已被讨论作为这种分歧的可能来源。借助物理体模实验，我们量化了主动涡电流对电和磁信号强度的影响，并测试了标准源定位算法重建涡电流的能力。活动涡流由一组12个单电流偶极子组成，排列成一个圆圈，并安装在一个类似于人体躯干的体模内。磁和电数据同时记录，而偶极子是逐步打开一个接一个。磁信号强度随偶极数目的增加而不断增加，电信号强度先增加一个周期，然后下降。源重建与无约束的焦点源模型进行了良好的一个单一的偶极子（小于3毫米的定位误差）。最小范数源重建产生了合理的结果，只有少数的偶极子配置。总之，主动涡电流可以解释，至少部分地，磁和电采集的数据之间的差异，但需要改进的源模型重建。
Recent studies reported differential information in human magnetocardiogram and in electrocardiogram. Vortex currents have been discussed as a possible source of this divergence. With the help of physical phantom experiments, we quantified the influence of active vortex currents on the strength of electric and magnetic signals, and we tested the ability of standard source localization algorithms to reconstruct vortex currents. The active vortex currents were modeled by a set of twelve single current dipoles arranged in a circle and mounted inside a phantom that resembles a human torso. Magnetic and electric data were recorded simultaneously while the dipoles were switched on stepwise one after the other. The magnetic signal strength increased continuously for an increasing number of dipoles switched on. The electric signal strength increased up to a semicircle and decreased thereafter. Source reconstruction with unconstrained focal source models performed well for a single dipole only (less than 3-mm localization error). Minimum norm source reconstruction yielded reasonable results only for a few of the dipole configurations. In conclusion active vortex currents might explain, at least in part, the difference between magnetically and electrically acquired data, but improved source models are required for their reconstruction.
影响因子：
3.4
作者：
Roth,BJ;WikswoJr,JP
通讯作者：
WikswoJr,JP