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Hybrid variation bioelectrical impedance imaging method

A technology of bioelectrical impedance and imaging method, which is applied in the field of measuring the conductivity of the chest cavity of the body, and can solve problems such as the inability to obtain lung electrical impedance reconstruction images, excessive smoothness, and step effect

Active Publication Date: 2016-10-26
HEBEI UNIV OF TECH
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Problems solved by technology

[0006] The invention relates to a mixed variation bioelectrical impedance imaging method, which involves measuring the electrical conductivity of the chest cavity of a human body. The method adopts the finite element method to simulate the spatial distribution of potentials, establishes a numerical model of bioelectrical impedance imaging technology, and converts large-scale numerical values The model is discretized into smaller units, certain boundary conditions are applied and the boundary voltage is calculated, the two-dimensional chest cavity numerical model and the three-dimensional chest cavity numerical model are respectively established, the objective function of the mixed variation algorithm is determined, and the inverse problem is solved by the steepest descent method and the chest cavity Electrical impedance image reconstruction, to illustrate the improvement of the resolution of the reconstructed image, overcomes the influence of noise and errors in the process of reconstructing images with higher resolution in the existing bioelectrical impedance imaging technology, resulting in excessive smoothing and staircase effects, Drawbacks of not being able to obtain accurate electrical impedance reconstruction images of the lungs

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Embodiment

[0096] In this embodiment, in the two-dimensional positive problem simulation experiment, a normalized two-dimensional circular domain model is used, which simulates the human chest structure, and solves the distribution of the chest potential when the current is injected, wherein the radius of the circle is 15cm . Divide the normalized circular domain model into relatively uniform triangular grids. The electrode points are located on the edge of the circle. The isotropic conductivity distribution, the background conductivity is 1Ω·m, and the target conductivity is set to 2Ω·m. In this embodiment, the two-dimensional positive problem model of the chest cavity established by the finite element method has a total of 6400 elements and a total of 3281 nodes.

[0097] In this embodiment, in the three-dimensional positive problem simulation experiment, a chest cavity model is used. The model uses 64 circular electrodes, and the electrodes are placed on the side surface of the chest...

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Abstract

The invention provides a hybrid variation bioelectrical impedance imaging method, relating to the measurement on the conductivity of the pleural cavity of the body. According to the method, the potential spatial distribution condition is simulated by adopting a finite element method, a numerical model of the bioelectrical impedance imaging technology is established, a numerical model with large size is dispersed into small units, certain boundary conditions are applied and boundary voltage is calculated, a two-dimensional thoracic cavity numerical model and a three-dimensional thoracic cavity numerical model are respectively established, after the objective function of the hybrid variation algorithm is determined, the inverse problem solving is carried out by adopting the steepest descent method, the electrical impedance image reconstruction of the thoracic cavity is carried out, so that the resolution ratio of the reconstructed image is improved, therefore, the problems in the existing bioelectrical impedance imaging technology, the influences of noises and errors exist during the process of reestablishing the image with high resolution ratio, consequently, the excessive smooth and staircase effect are caused, and the accurate electrical impedance reconstructed image of the lung can not be obtained are solved.

Description

technical field [0001] The technical solution of the invention relates to measuring the electrical conductivity of the chest cavity of a human body, in particular to a mixed variation bioelectrical impedance imaging method. Background technique [0002] Electrical Impedance Tomography (EIT) is a new generation of medical imaging functional technology that emerged in the past 30 years after morphology and structure imaging. According to the different electrical impedance characteristics of different tissues in the human body under different physiological and pathological conditions, a small safe excitation current or voltage is applied to the human body through the body surface electrodes, and the corresponding voltage or current signal is measured on the human body surface to reconstruct the inside of the human body The electrical impedance distribution image. Physiological function changes or pathological changes of human tissue will cause changes in the electrical impedan...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B5/053
CPCA61B5/0536A61B5/72
Inventor 张帅郭云鸽张雪莹赵明康王宏斌赵军郭苗苗李颖徐桂芝
Owner HEBEI UNIV OF TECH
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