| Issue |
MATEC Web Conf.
Volume 128, 2017
2017 International Conference on Electronic Information Technology and Computer Engineering (EITCE 2017)
|
|
|---|---|---|
| Article Number | 04007 | |
| Number of page(s) | 4 | |
| Section | Computer Programming | |
| DOI | https://doi.org/10.1051/matecconf/201712804007 | |
| Published online | 25 October 2017 | |
Measurement Method and Principle for Thoracic Impedance Graph
Department of Electronic Engineering, Nanchang Institute of Technology, Nanchang 330044, China
a Corresponding author: 270689016@qq.com.cn
Thoracic impedance graph is an impedance change curve measured on the surface of the human chest. It reflects indirectly the volume change of the heart and large vessels in the thorax, and it includes rich information about physiological activities and pathological changes. Thoracic impedance graph is measured using the four-electrode method in this article. Thoracic impedance change is transformed to the voltage change by means of the high frequency current Io, with a constant root-mean-square (rms) current. The voltage change which is directly proportional to thoracic impedance change can be obtained through the amplification, detection and calibration. The direct proportional relationship between the thoracic impedance change and volume change of the blood vessels is deduced by means of the thoracic parallel impedance model.
© The authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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