A three-dimensional medical electrical impedance imaging method

Abstract

The invention discloses a three-dimensional medical electrical impedance imaging algorithm, which transforms the medical electrical impedance imaging into an inverse problem for solving. According to the three-dimensional finite element model of the organism, the linear function of the design variable and the conductivity is established, and the square of the electrostatic field formed after the organism is stimulated by the safety current and the residual error of the electrostatic field of the finite element model is used as the objective function, and the three-dimensional medical resistance is established. An optimized model for anti-imaging. The adjoint sensitivity method is used to derive the sensitivity of the objective function, which is used as the design variable to update the iterative information, and the electrical impedance iterative imaging is carried out until convergence. The three-dimensional medical electrical impedance imaging algorithm disclosed by the invention has a rigorous mathematical theory, is convenient for calculating the optimization iterative information of the inverse problem of electrical impedance imaging, does not require prior information, and can realize medical electrical impedance imaging of a three-dimensional biological model.

Description

technical field [0001] The invention belongs to the field of medical imaging, and more specifically relates to a three-dimensional medical electrical impedance imaging algorithm. Background technique [0002] According to the physical characteristics of different tissues in the living body with different electrical conductivity, electrical impedance imaging technology measures the surface potential of the living body by injecting a safe current, and reconstructs the resistivity image inside the living body. Many diseases, such as brain diseases, breast diseases, lung diseases, etc., will cause changes in the conductivity of organs and tissues in organisms. Electrical impedance imaging technology can reflect changes in the conductivity of tissues in vivo, and has broad application prospects in the detection and monitoring of the above-mentioned diseases. [0003] In the electrical impedance imaging system, the imaging algorithm with high precision, high resolution and fast c...

AI Technical Summary

Problems solved by technology

The existing electrical impedance imaging algorithm generally converts the imaging problem into an inverse problem solution, which requires iterative calculation and solution, involving Jacobian matrix calculation, matrix inversion, etc., and there is a problem that the amount of calculation is too large

In addition, a large number of electrical impedance imaging algorithms are based on two-dimensional models. Although the complexity of the model and the amount of calculation are reduced, there are more three-dimensional models in actual engineering, and two-dimensional models are prone to loss of imaging accuracy.

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