乳腺电阻抗成像非均匀介质电场的初步分析

The Analysis of the Inhomogeneous Medium's Electric Field Based on EIT

目的:在验证旋转电极法对乳腺电阻抗断层成像的方法的可行性之后,进一步对非均匀电场分布进行分析,为此后的成像算法修正提供依据,以便能获得更接近实际的阻抗分布图像。方法:基于EIT实验平台,利用NaCl溶液模拟均匀介质,铁棒模拟引入到均匀介质中电导率不同的非均匀介质,研究铁棒在NaCl溶液中不同位置对其电场分布的影响。结果:得到铁棒在NaCl溶液中的轴对称位置上对中间测量电极下的电流值影响及铁棒在NaCl溶液中不同的位置对中间测量电极的电流值影响。结论:在研究电导率不同的铁棒对均匀介质NaCl溶液电场影响的实验中,该实验结果为下一步对成像算法的修正及提高重建的图像的分辨率提供了指导。

Objective： Analyzing the distribution of the electric field of the inhomogeneous media after testifying the feasibility of the method based on electrical impedance tomography （EIT）. This work provides a reference on modifying the algorithm and attaining the impedance image which approaches to the practice furthermore. Method： Based on the fiat of EIT experiment, discuss the distribution of the electric field of the NaCI solution when the pontil which simulates the inhomogeneous medium is in the different position of the NaCI solution which simulates the homogeneous medium. Result： Get the variation of the electricity in the middle measuring electrode when the pontil is in the symmetrical and other different position of the NaCI solution. Conclusion： The conclusion of this experiment serves as a guideline for the amendment of the algorithm and the improvement of the resolution of the reconstructed imaging.