Optimized adaptive extended Kalman filter bioelectrical impedance imaging method

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...

AI Technical Summary

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 imaging The technology has the disadvantages of low anti-noise ability, high precision of reconstructed image and small amount of calculation at the same time. The existing public Kalman filter algorithm applied to reconstructed image still has the defects that the algorithm accuracy may lose the original performance and the filter diverges

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