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Electrical impedance tomography method integrating skull specific resistance non-uniform distribution information

A non-uniform distribution, resistivity technology, applied in computer tomography, diagnosis, echo tomography, etc., can solve the problems of EIT image spatial resolution degradation, inaccurate imaging target positioning, and restricting the clinical application of EIT technology. Achieve the effect of improving positioning accuracy, improving image quality and accurate response

Active Publication Date: 2014-03-26
FOURTH MILITARY MEDICAL UNIVERSITY
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Problems solved by technology

If the skull is approximated as a layer structure with uniform resistivity distribution in EIT imaging, then the current density distribution form in the cranial cavity incorporated in the reconstruction calculation will be completely different from the real form of the measured object, resulting in degradation of the spatial resolution of the EIT image , the imaging target positioning is not accurate, which seriously restricts the clinical application of EIT technology

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  • Electrical impedance tomography method integrating skull specific resistance non-uniform distribution information

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Embodiment Construction

[0039] The specific implementation steps of the electrical impedance tomography method incorporating the non-uniform distribution information of skull resistivity according to the present invention are as follows:

[0040] Step 1, obtaining the axial CT scanning data of the level where the electrical impedance imaging measurement electrodes of the subject's head are located;

[0041]Step 2, automatically dividing the anatomical structure of the head according to the CT scan data, and obtaining the hierarchical structure information of the head tissue;

[0042] Step 3, processing the CT data of the skull layer to obtain the distribution information of the compact bone and the barrier layer;

[0043] Step 4, constructing a realistic finite element model of the head using the hierarchical structure information of the head organization as a limiting condition;

[0044] Step 5, configure the non-uniform distribution of skull resistivity and the resistivity distribution information...

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Abstract

The invention relates to an electrical impedance tomography method integrating skull specific resistance non-uniform distribution information. According to the method, the anatomical structure information provided by head CT data of detected objects, and a statistical parameter model of the thickness of a skull diploe layer and a skull specific resistance value are utilized for setting up a head two-dimension finite element model comprising skull specific resistance non-uniform distribution, and an electrical impedance tomography image is reconstructed on the basis of the model. According to the method, the real distribution information of skull organization specific resistance is fast and automatically integrated in the imaging algorithm, the result of image reconstruction is corrected, the location precision and the image spatial resolution of imaging objects are improved, the image quality of the head electrical impedance tomography is improved, and the usability of head electrical impedance tomography in practical use is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical impedance tomography, and relates to a method for obtaining an impedance distribution image in a subject through the electrical impedance tomography technology, and in particular to an electrical impedance tomography method incorporating information on non-uniform distribution of skull resistivity. Background technique [0002] Electrical Impedance Tomography (EIT) is a new generation of non-invasive functional imaging technology following morphological and structural imaging. The basic principle is that different tissues in the human body have different conductivity (resistivity) under different physiological and pathological conditions, by applying a safe driving current (voltage) on the surface of the human body, measuring the response voltage (current) signal in vitro and then reconstructing the reflection An image of the distribution or changes in electrical conductivity inside the human b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053A61B6/03
Inventor 董秀珍杨滨汤池付峰史学涛刘锐岗尤富生季振宇徐灿华代萌王楠
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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