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Image reconstruction method in quasi-static electrical impedance imaging

A technology of electrical impedance imaging and image reconstruction, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of indistinguishable lesions and a large number of artifacts in reconstructed images, so as to achieve clear reconstruction results, eliminate artifacts, The effect of improving the quality of the reconstructed image

Inactive Publication Date: 2013-04-24
FOURTH MILITARY MEDICAL UNIVERSITY
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Problems solved by technology

[0005] Each tissue of the human body has certain impedance spectrum characteristics, so the measurement data under different excitation frequencies not only contains information about lesions but also information about normal tissues, so the differential results of data at different frequencies contain a large amount of non-lesion tissue impedance Therefore, it will lead to a large number of artifacts in the reconstructed image, and even the lesion cannot be distinguished

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  • Image reconstruction method in quasi-static electrical impedance imaging
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  • Image reconstruction method in quasi-static electrical impedance imaging

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[0032] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0033] The image reconstruction method in the quasi-static electrical impedance imaging provided by the present invention comprises the following steps:

[0034] 1) Using the electrical impedance imaging method, the target to be measured is at a frequency of and Excited under the current excitation, collect the boundary voltage under the two current excitations and Then, weighted difference processing is performed on the collected data to obtain the boundary voltage change ΔV caused by the impedance change difference of the target area under different frequency excitations;

[0035] 2) Then calculate the target area impedance distribution change Δρ under different frequency excitations, and use the target area impedance distribution changes Δρ under different frequency excitations to r...

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Abstract

The invention discloses an image reconstruction method in quasi-static electrical impedance imaging. The image reconstruction method utilizes an electrical impedance imaging method. A to-be-tested object is excited under current excitation with frequency, namely f (omega1) and f (omega2) respective, boundary voltages, namely V' (omega1) and V' (omega 2) under the two times of current excitation are collected, and collected data undergo the process of weighting and difference calculating. A boundary voltage variation delta V caused by difference of impedance change of a target area excited by different frequency is calculated, and impedance distribution change delta Rho of the target area excited by different frequency is calculated. The impedance distribution change delta Rho of the target area excited by different frequency is utilized to reconstruct an electrical impedance tomography (EIT) image. According to the image reconstruction method in quasi-static electrical impedance imaging, before two groups of measured data with different frequency are used for imaging, affection of non-target information on a reconstruction result in an imaging area is considered, and a data processing manner of weighting and difference calculating is raised. Artifacts produced in a reconstructed image by the non-target information are effectively removed, target identification is improved, and quality of the reconstructed image is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical impedance tomography, and relates to an image reconstruction method in quasi-static electrical impedance imaging. Background technique [0002] Electrical impedance tomography (electrical impedance tomography, EIT) is a new type of medical imaging technology. By applying a safe excitation current (voltage) to the human body and measuring the voltage (current) signal on the surface of the body at the same time, a certain level of the human body can be obtained through reconstruction. The distribution of impedance or impedance changes within a fault. [0003] Electrical impedance tomography can be divided into: static imaging (using the absolute value distribution of impedance as the imaging target) and dynamic imaging (taking the change of impedance as the imaging target). Due to the strict requirements on the data acquisition system of static imaging, it is limited in practical application and...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 董秀珍杨琳付峰尤富生漆家学史学涛刘锐岗季振宇徐灿华杨滨代萌
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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