Multi-depth layer electric impedance tomography system

Abstract

The invention provides a multi-depth layer electrical impedance tomography imaging system which detects a plurality of subcutaneous tomograms paralleling to different depth layers on the surface of the skin by the measurement of voltage amplitudes of a plurality of different electrodes. When in practical medical inspection, the subcutaneous practical impedance information of a human body is reconstructed by the measurement of the voltage amplitudes of the plurality of different electrodes. Firstly, a plurality of tomograms paralleling to the contact surface of the skin and an electrode disk and under the electrodes are set. The depth of each tomogram can be preset according to detection demands, and then all tomograms are respectively dissected, i.e. all tomograms are dissected into a plurality of small areas. The detection purpose for obtaining the corresponding impedance value of all small areas in all set tomograms can be achieved, and the impedance values are showed by a picture so as to obtain the tomography information of a plurality of subcutaneous tomograms paralleling to different depth layers on the surface of the skin.

Description

technical field [0001] The invention relates to the field of biomedical signal detection, and is mainly used for bioelectrical impedance tomography detection. Background technique [0002] Medical electrical impedance technology is a detection technology that utilizes the electrical characteristics and changing laws of biological tissues and organs to extract biomedical information related to human physiological and pathological conditions. It usually uses an electrode system placed on the body surface to inject a small AC measurement current or voltage amplitude into the test object, detect the corresponding electrical impedance and its changes, and then obtain relevant physiological and pathological information according to different application purposes. It has the characteristics of non-invasive, harmless, cheap, safe, easy to operate and rich in functional information, and is easy to accept by doctors and patients. [0003] From the perspective of cytology, the basic s...

AI Technical Summary

Problems solved by technology

[0009] First, the use of this method is limited to the brain of the human body. The chest, abdomen, and limbs can be approximated as a cylindrical part with a certain electrical impedance distribution. Each time, the electric field distribution can only be measured on the edge of the fault where the electrode arrangement plane is located. Obtain the tomographic information of the human subcutaneous parallel to the skin surface

[0010] Second, there is a detection blind area in this method, and the approximate effective area of ​​detection is as follows figure 2 shown

The reasons for this phenomenon can be summarized as follows: firstly, in the circular plane of detection, the area relatively close to the electrode is often unable to obtain the ideal detection effect due to the interference of the excitation current

Secondly, only a small amount of current passes through the central area relatively far from the electrode, and it is difficult to obtain information about the impedance of the central area.

[0011] Third, because the electrodes are arranged in a ring, their number and distribution are very limited, the amount of information obtained is small, and the image effect is not ideal

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