Optimized adaptive extended Kalman filter bioelectrical impedance imaging method

A technology for extending Kalman and bioelectrical impedance, applied in the field of electrical impedance, it can solve the problems of loss of algorithm accuracy, low anti-noise ability, and small calculation amount of reconstructed image accuracy.

Pending Publication Date: 2020-11-17
HEBEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In the reconstruction process, the present invention introduces an optimized self-adaptive correction coefficient to increase the weight of observations, adjusts the Kalman gain matrix online, improves the stability of the Kalman algorithm in electrical impedance imaging, and overcomes the existing public bioelectrical impedance imagin

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  • Optimized adaptive extended Kalman filter bioelectrical impedance imaging method
  • Optimized adaptive extended Kalman filter bioelectrical impedance imaging method
  • Optimized adaptive extended Kalman filter bioelectrical impedance imaging method

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Embodiment

[0124] In this embodiment, an optimized adaptive extended Kalman filter bioelectrical impedance imaging method, the specific steps are as follows:

[0125] A. Setup for optimization of the adaptive extended Kalman filter electrical impedance imaging apparatus used:

[0126] The device used for optimization and adaptive extended Kalman filter electrical impedance imaging adopts a modular design, such as Figure 5 As shown, it is a series and parallel hybrid structure, and its composition includes a computer module, a communication module, a general control and processing module, a voltage / current constant current output module, an excitation channel gating module, a measurement channel gating module, an electrode array and Signal modulation module; the computer module is used to control the program operation of the general control and processing module and the adaptive extended Kalman filter imaging algorithm. The general control and processing module receives instructions from...

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Abstract

The invention discloses an optimized adaptive extended Kalman filter bioelectrical impedance imaging method, and relates to measurement of electrical impedance of a certain part of the body. Reconstruction of a human body lower limb electrical impedance image is conducted by using the optimized adaptive extended Kalman filter bioelectrical impedance imaging method. The method comprises the following steps of establishing a human lower limb mathematical model based on real structure prior information; solving a direct problem; solving an inverse problem by using an optimized adaptive extended Kalman filtering algorithm; and outputting the human lower limb electrical impedance reconstruction image. According to the method, an optimized adaptive correction coefficient is introduced in the reconstruction process to improve the weight of the observed quantity, and a Kalman gain matrix is adjusted online, so that the stability of the Kalman algorithm in electrical impedance imaging is improved, the defects that an existing disclosed bioelectrical impedance imaging technology has low anti-noise capability and cannot realize high reconstruction image precision and small calculation amountat the same time are overcome, and an existing disclosed Kalman filtering algorithm applied to the reconstruction image still has the defects that the algorithm precision may lose the original performance and the filter divergence may be caused.

Description

technical field [0001] The technical solution of the invention relates to measuring the electrical impedance of a certain part of the body, in particular to an optimized adaptive extended Kalman filter bioelectrical impedance imaging method. Background technique [0002] Electrical Impedance Tomography (EIT) is a low-cost, non-invasive imaging technique that obtains the potential on the surface by injecting an appropriate current pattern through contact electrodes placed on the surface of the object, thereby measuring High-resolution surface potential values ​​are used to estimate electrical properties, such as conductivity distribution, inside object cross-sections. Electrical impedance imaging has been used in industry, geophysics, and other fields of engineering and applied science. In geophysics, it is used to locate the distribution of underground mineral resources. In oil extraction, it has been used to monitor the flow of injection fluids into the earth. Biological...

Claims

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Application Information

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IPC IPC(8): A61B5/053
CPCA61B5/0536Y02P90/02
Inventor 赵明康郑天予张帅张雪莹李颖王宏斌徐桂芝
Owner HEBEI UNIV OF TECH
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