AN EXPERIMENTAL-STUDY IN ELECTRICAL-IMPEDANCE TOMOGRAPHY USING BACKPROJECTION RECONSTRUCTION
AN EXPERIMENTAL-STUDY IN ELECTRICAL-IMPEDANCE TOMOGRAPHY USING BACKPROJECTION RECONSTRUCTION
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DOI：
10.1109/10.83560
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发表时间：
1991-07-01
影响因子：
4.6
通讯作者：
BERTRAND, M
中科院分区：
文献类型：
--
作者：
GUARDO, R;BOULAY, C;BERTRAND, M
本文报告了旨在评估等电位反投影方法在对电阻抗断层扫描的拟议应用进行建模的条件下的性能的实验。小型球形目标被放置在一个充满盐水的水箱内，其尺寸与人体躯干相似。 使用基于计算机的仪器获取数据，该仪器将电流施加到位于两个水平面上的电极对并记录第三个平面的电极之间的电位差。 在重建图像上测量均匀盐水背景中非导电球体产生的相对对比度，并用于确定系统对目标体积以及单个球体的径向和垂直位置的灵敏度。结果表明，对于临界半径内的径向位置，当球体中心位于记录平面上时，灵敏度始终最大，而当目标移出该平面时，灵敏度逐渐降低。 利用从多个记录平面获取的数据对简单目标进行 3D 定位似乎是可行的。 结果为解释具有复杂 3D 电导率分布的图像提供了指导。
This paper reports on experiments designed to evaluate the performance of the equipotentials backprojection method under conditions modeling those of proposed applications of electrical impedance tomography. Small spherical targets were placed inside a saline-filled tank with dimensions similar to a human torso. Data were acquired with a computer-based instrument that applies current to pairs of electrodes located on two horizontal planes and records potential differences between electrodes of a third plane. The relative contrast produced by nonconducting spheres in a uniform saline background was measured on the reconstructed images and used to determine system sensitivity to target volume and to the radial and vertical positions of single spheres.Results show that for radial positions within a critical radius sensitivity is always maximum when the spheres center is on the recording plane and decreases gradually when the target is moved outside this plane. Localization of simple targets in 3-D, with data acquired from multiple recording planes, appears feasible. The results provide guidelines for the interpretation of images with complex 3-D conductivity distributions.