Abstract：In clinical research of EIT (Electrical Impedance Tomography), it was important to evaluate the change degree of target resistance perturbation. At present, most of the EIT reconstruction algorithms were developed using linearized techniques based on the assumption that the impedance change of target perturbation was small. Therefore, if the impedance change of target perturbation was large, the reconstruction result might produce great errors between the reconstructed value and the actual value, which made it difficult to evaluate the precise value of target perturbation, especially for strong perturbation. In view of this problem, the paper proposed a compensation method for strong-perturbation-target-based EIT. Through study and analysis of reconstruction algorithms, the source of the error in linearization method was identified firstly. Then, the correlation between the actual value and reconstructed value of perturbation targets was established through simulation models, based on which a logarithmic correction and compensation method was introduced. Finally, a simulation experiment was conducted to verify the accuracy of the method. The simulation results showed that the method could effectively reduce the errors between the reconstructed value and the actual value and realize the reconstruction of strong perturbation targets, which laid a foundation for accurate identification of target resistance perturbation changes in further clinical application.
徐灿华，陈荣庆，代萌，杨滨，杨琳，夏军营，刘本源，史学涛，尤富生，董秀珍，付峰. 基于强扰动目标的电阻抗断层成像补偿方法研究[J]. 中国医疗设备, 2015, 30(7): 1-4.
XU Can-hua, CHEN Rong-qing, DAI Meng, YANG Bin, YANG Lin, XIA Jun-ying, LIU Ben-yuan, SHI Xue-tao, YOU Fu-sheng, DONG Xiu-Zhen, FU Feng. A Compensation Method for Strong-Perturbation-Target-Based EIT. China Medical Devices, 2015, 30(7): 1-4.
