Evaluating Deformation Corrections in Electrical Impedance Tomography
Evaluating Deformation Corrections in Electrical Impedance Tomography
复制标题
评估电阻抗断层扫描中的变形校正
DOI：
10.1088/0266-5611/14/1/012
复制
发表时间：
2008
期刊：
影响因子：
2.1
通讯作者：
A. Adler
中科院分区：
文献类型：
--
作者：
A. Boyle;W. Lionheart;C. Gomez;A. Adler
电阻抗断层扫描（EIT）用途
表面电极之间的测量差异，
重建所包含的导电性的图像，
介质然而，测量结果的变化是由于
内部导电性的变化和形状的变化
相对于电极位置的介质。未能
考虑到形状变化，
重要的文物。以前处理形状变化的工作
在EIT中已经表明：a）理论上，对于无限多的
电极，边界形状的非共形变化，
可以唯一地确定电极位置（Lionheart，
1998）;和B）在某些情况下，导电性和形状变化
可以使用组合的图像重建模型来恢复
导电性和形状变化（Soleimani等人，2006年）。
这项工作表明，形状变化问题可以
得到部分解决。在本文中，我们探讨了
在EIT边界移动的补偿，使用三个
方法：首先，建立了一个理论模型，
变形向量场分为共形和非共形
组件，从这些组件中可以确定重建极限。
确定;接下来，有限元模型由
其中EIT测量是模拟的;最后，实验
使用可变形垫圈构建体模
和不锈钢电极在盐水介质中，
获取边界变形测量。
Electrical Impedance Tomography (EIT) uses
the difference in measurements between surface electrodes to
reconstruct an image of the conductivity of the contained
medium. However, changes in measurements result from
changes in internal conductivity and changes in the shape
of the medium relative to the electrode positions. Failure to
account for shape changes results in a conductivity image with
significant artifacts. Previous work to address shape changes
in EIT has shown that: a) theoretically, for an infinite number
of electrodes, non-conformal changes in boundary shapes and
electrode locations can be uniquely determined (Lionheart,
1998); and b) in some cases, conductivity and shape changes
can be recovered using a combined image reconstruction model
of both conductivity and shape changes (Soleimani et al, 2006).
This work has shown that the shape change problem can
be partially addressed. In this paper, we explore the limits
of compensation for boundary movement in EIT, using three
approaches: first, a theoretical model is developed to separate
a deformation vector field into conformal and non-conformal
components, from which the reconstruction limits may be
determined; next, finite element models are constructed from
which EIT measurements are simulated; finally, an experimental
phantom is constructed using a deformable gasket
and stainless steel electrodes in a saline medium, from which
boundary deformation measurements are acquired.