Sparse reconstruction method for electrical impedance tomography

A technology of electrical impedance imaging and sparse reconstruction, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problems of image artifacts, unfavorable electrical impedance imaging clinical promotion and application, etc., achieve fast calculation speed, improve electrical impedance The effect of image quality and noise immunity

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

[0003] However, in practical applications, due to the limitation of the measurement mode, that is, only a limited number of electrodes can be set on the body surface of the human body, and the inevitable errors and noises in the measurement process cause serious artifacts in the image.
Some important changes in electrical impedance inside the human body may not be reflected in time by electrical impedance imaging, which is not conducive to the clinical promotion and application of electrical impedance imaging

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  • Sparse reconstruction method for electrical impedance tomography
  • Sparse reconstruction method for electrical impedance tomography
  • Sparse reconstruction method for electrical impedance tomography

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Embodiment Construction

[0029] 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.

[0030] In the electrical impedance dynamic imaging problem, by analyzing the conductivity distribution of the dynamic electrical impedance image x=x 2 -x 1 , most of the specific conductivity values ​​are 0 or approximately 0 in value. Such as figure 1 , figure 2 The target is the non-uniform conductivity of the dynamic electrical impedance image x = x 2 -x 1 , where x 1 is the conductivity distribution of the previous frame, x 2 is the conductivity distribution of the current frame, and x is the result of differential imaging, so x is the change between two frames, so the conductivity x has the characteristics of sparseness, and then the sparse reconstruction technology is introduced when performing electrical impedance imaging reconstruction.

[0031] The dynamic electrical impedan...

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Abstract

The invention discloses a sparse reconstruction method for electrical impedance tomography. The conductivity distribution of the dynamic electrical impedance tomography has the sparse property, when the electrical impedance tomography is restructured, regular terms of the restructured objective function use the L1 normal number, the sparse property of non-uniform conductivity is introduced to regular terms, the objective function is calculated through a convex optimization problem solving method, and the restructured electrical impedance tomography is obtained. L1 normal regular terms are used for resisting noise effectively, the non-uniform conductivity is introduced to regular terms, the quality and the noise-resisting capability of the electrical impedance tomography can be improved, and the calculation speed is fast.

Description

technical field [0001] The invention belongs to the technical field of electrical impedance imaging, and relates to a sparse reconstruction method of electrical impedance imaging. Background technique [0002] Electrical impedance tomography is a new type of medical imaging technology, which is based on the fact that different biological tissues have different resistivity characteristics, and changes in pathophysiological functions will also significantly change the characteristics of tissue electrical impedance characteristics. Put a circle of body surface electrodes, and inject a weak, completely non-invasive AC current into the body through these electrodes, and then measure the response voltage signal on each electrode, and finally achieve a certain section or area through a specific image reconstruction algorithm. Imaging of two-dimensional or three-dimensional distribution of tissue electrical impedance properties. Because this technology is non-invasive and harmless ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
Inventor 董秀珍常甜甜付峰尤富生徐灿华代萌
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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