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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 40931 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Vosoughi Vahdat, Bijan
- Abstract:
- Electrical impedance tomography is considered as medical and industrial imaging methods which is inexpensive and safer than other imaging methods, but has low quality results. The purpose of this study is providing a practical method to increase its quality. Image reconstruction in EIT always is encountered with both direct and inverse problem. In the forward problem electric potential distribution is achieved from known distribution of electrical impedance and currents, but in the inverse problem, identifying of electrical impedance distribution is the target which is achieved by known electric potential and current distribution. In fact, solving inverse problem results the image reconstruction. Inverse problem solving methods are: Linearization algorithms , Iterative techniques for solving nonlinear problem, Methods based on resistive network model, Reconstruction algorithms with direct methods. In this paper a new method with uncompress outlook in electrical circuits is presented which leads to solving electrical impedance tomography by block approach. For this purpose, relations of proposed method to solve forward problem in two-dimensional mode is obtained. Three methods to solve the inverse problem is presented and compared with other methods. After comparing the results of the proposed method with other methods and correcting for having less error, relations for three-dimensional mode is presented.
- Keywords:
- Electrical Impedance Tomography ; Forward Problem ; Inverse Problem ; Finite Element Method ; Block Method ; Ill Possed Problem
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