Preliminary Design Of Portable Medical Electrical Tomography Chest Monitoring System

In the detection of human thorax disease,X-rays,CT and other invasive imaging methods are used clinically because of the accuracy.But these medical visualization methods both have a little amount of radiation,and are not able to perform real-time monitoring,so that a new technology called Electrical Tomography was used by majority of scientists for studying biological tissue imaging.Electrical Tomography,also known as Electrical Impedance Tomography(EIT)technology,which uses the distribution or changes of electrical impedance as the target to image is a new non-invasive bio-medical detection and imaging technology.Because of the safety,simple,inexpensive and non-invasive advantages,EIT technology can be used for long-term and real-time monitoring,which has a great significance and big application prospects in early prevention,diagnose and treatment of diseases.In the measurement of a two-dimensional object field of human chest,all measuring electrodes(number usually is 16 or 32)to be examined must be fixed at a cross-section of the surface of the chest,while the size of the chest detected by the electrodes will change during respiration.Current measurement methods can not adapt to the dynamic changes of the measurement point,which can not achieve real-time dynamic data collection of human chest.This paper designs a portable chest sensor device to facilitate the determination of the position of electrodes so that we can achieve real-time dynamic border measurements and get accurate border data for the acquisition.This paper also designed an EIT system for data acquisition and the data can be sent to the PC for imagination through USB.The EIT system in this paper uses the DSP+FPGA architecture to control and process measurement data.This method can effectively play the advantages of DSP and FPGA and provide a good hardware platform for migrating the algorithm from PC to lower computer in the future.