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International Society for Industrial Process Tomography

11th World Congress on Industrial Process Tomography

A Four-Dimensional Numerical Model for Cardiac Electrical Impedance Tomography

Baorui Bai1, Shangjie Ren1*, Feng Dong1

1The authors are with the Tianjin Key Laboratory of Process Measurement and Control, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China.

*Email: rensjie@tju.edu.cn


ABSTRACT

Electrical Impedance Tomography (EIT) is a kind of non-invasive functional imaging technology, which is sensitive to changes in the electrical properties of biological tissues. Compared with other imaging technologies, EIT has the advantages of low cost, portable equipment, and no radiation. The volume change caused by the beating of the heart can be reflected by its conductivity distribution, so EIT can be used for real-time monitoring and imaging of the heart. However, there are not many studies on 4D models of the heart, the existing research mainly includes image segmentation algorithms and optimization of 3D models. 4D adds the time dimension, which can obtain more time-related parameter information in the heart. The articles use XCAT to extract the three-dimensional models of the human thoracic cavity, lungs and heart. To find the optimal model settings, ten imaging models were established based on different prior information. And the article discusses the reconstruction results of the different models under different noise levels. At the same time, a new evaluation index ACI (Average cardiac impedance) is proposed for cardiac EIT dynamic imaging, which describes the beating process of the heart in a cardiac cycle through the change of electrical conductivity, and verified its correlation with the change of the real volume of the heart. The qualitative and quantitative indicators of the imaging results of different models were compared and evaluated, and the optimal setting were finally obtained.

Keywords: Electrical Impedance Tomography, Four-Dimensional Cardiac Model, Imaging Model

Industrial Application: Cardiac Function, Medical Dynamic Monitoring

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