Analysis Of Electrical Impedance Tomography Sensitivity Field Based On Electroencephalogram Electrodes Model

EIT(Electrical Impedance Tomography)is based on the principle that in human body different tissues have different conductivities.By injecting safe current to the surface of human body,the potential information of the corresponding body surface is measured to conduct image reconstruction of the distribution of electrical conductivity or its changes in the human body.EIT imaging has many advantages,for example,non-invasive,non-invasive and continuous measurement.It is one of the hot topics in biomedical engineering nowadays and also has important applications in other industrial fields.The main research of this paper is analysis of Electrical Impedance Tomography sensitivity field based on Electroencephalogram electrodes model.Based on previous works,we have completed the following works:1.First,the status of EIT imaging technology at home and abroad is analyzed and summarized in detail.And we briefly introduced the electroencephalogram(EEG).A EIT measurement mode based on EEG electrode placement on the human head is proposed in brief.2.The advantages and disadvantages of the two types of traditional brain modeling are analyzed,and we used the model of the female head CT data sets to build a three-dimensional brain three-layer finite element model,and the image segmentation and three-dimensional entity conversion was described in detail.After finite element analysis,follow up a series of simulation calculations.The simulation results show that the brain model is closer to the human real head model than the traditional three layer sphere model,and provides a more real imaging model for EIT brain functional imaging.3.The electrode collar based on the EEG point based EIT measurement mode is proposed.By selecting the same EEG electrodes placement as the EIT measurement mode,we can use electrode collar to collect and record the EEG signals and can also be used for the measurement of the EIT,which has the advantage of single channel and multimodal.In addition,a 16-electrode collar based on the EEG electrode placement is used to measure the three layer solid model of the three-dimensional brain.The result of simulation shows that when the position of the electrode is between the middle and the lower part of the head model,the influence of the electrode position to the sensitive field is relatively small.4.The 8-electrode collar and 16-electrode collar were set up.Under the adjacent excitation and counter electrode measurement,the electrode 1 and 2 were applied Safety exciting current.The effect of the number of electrodes on the equal potential distribution in the field of the brain was analyzed.The simulation results show that with the increase of electrode number,the equipotential distribution in the brain field tends to be uniform,which can improve the image reconstruction quality of EIT.