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Electrical impedance tomography method based on spatial spectrum estimating algorithm

A technology of spatial spectrum estimation and electrical impedance imaging, which is applied in calculation, material resistance, electrical digital data processing, etc., can solve the problems of poor positioning and imaging effects, and achieve good imaging effects

Inactive Publication Date: 2019-05-21
GUANGXI UNIV
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Problems solved by technology

[0006] In the process of realizing the present invention, the inventors found that the scheme of using the DOA of the MUSIC-like algorithm for electrical impedance imaging is more sensitive to the pixel block area with a large change in conductivity. When the conductivity of the pixel block area does not change much , the positioning and imaging effects are poor

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  • Electrical impedance tomography method based on spatial spectrum estimating algorithm

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Embodiment Construction

[0045] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0046] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0047] figure 1 It is a flowchart of an electrical impedance imaging method based on a spatial spectrum estimation algorithm according to an embodiment of the present invention. The electrical impedance imaging method includes steps S1 to S4.

[0048] In step S1, a circular area is surrounded by W electrodes.

[0049] In step S2, put the saline into the circular area, and use the method of cyclic adjacent excitation to o...

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Abstract

The invention discloses an electrical impedance tomography method based on a spatial spectrum estimating algorithm. The method comprises the steps of forming a circular area by W electrodes; inputtingbrine into the circular area, injecting current into each set of adjacent electrodes of the W electrodes by means of a circulating adjacent exciting method, and performing voltage measurement on theelectrodes without injecting current for obtaining a first set of measured data; placing a to-be-imaged object into saline water, and obtaining a second set of measured data by means of a same method;establishing a circular domain model of W electrodes in simulation software, dividing the circular domain to N pixel block areas, expanding the circular domain and the electrodes, converting a resistance imaging model to a spatial spectrum estimating mathematical model, performing spatial spectrum estimation by means of a m-Capon algorithm, solving the strength of the spatial spectrum, and determining the pixel block with the to-be-imaged object according to the peak value of the spatial spectrum. The electrical impedance tomography method utilizes the m-Capon algorithm for performing spatialspectrum estimation and can improve imaging quality of the pixel block on the condition of relatively low electrical impedance change.

Description

technical field [0001] The invention relates to the technical field of electrical impedance imaging, in particular to an electrical impedance imaging method based on a spatial spectrum estimation algorithm. Background technique [0002] Electrical Impedance Imaging Technology (EIT) is a new and non-destructive imaging technology. According to the difference in conductivity of different substances inside the object, a small alternating current excitation is applied to the electrode array placed on the surface of the human body to obtain the electrical conductivity of the electrodes. The electrical potential can be used to obtain the distribution of electrical conductivity inside the object, and then reconstruct the image of the internal structure of the object. [0003] MUSIC-like is an algorithm of spatial spectrum estimation (DOA) in radar signal processing. The purpose is to estimate which transmitter is working and the direction of the transmitter. Simply put, it is to us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04G01S13/89G06F17/50
Inventor 文珺韦国恩廖斌朱润发
Owner GUANGXI UNIV
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