Ji Zhenyu

Study of Electrical Impedance Scanning System for Breast Screening

An electrical impedance scanning (EIS) system was studied to meet the requirement of clinical breast screening. A quick examination, easy operation, safe electrical isolation and obvious diagnosis results are four main factors to a screening system. Basing on these considerations, a multi-frequency signal sampling system controlled by ARM chip was setup and the measuring data were transmitted to PC by an ethernet interface. For the measuring probe, three types of electrodes array were designed to adapt the different sizes of breast. Additionally, an imaging post-process algorithm was developed to assist the radiologist to have an obvious diagnosis results. Based on a saline-tank phantom and some satisfying results were got. The system has a character of high precision, real-time imaging and obvious results and can be used in the clinical study of EIS breast screening.

Study on Disease Screening and Monitoring System Based on Wireless Communication and IOT

This paper presents a disease screening and monitoring telemedicine system based on wireless communication and the Internet of Things(IOT) aiming at building a people-oriented and ubiquitous telemedicine environment . This paper focuses on the system architecture and key technologies, as well as the implementation method, in order to provide a theoretical and technical basis for further demonstration projects.

Study of influencing factors on Electrical Impedance Scanning Imaging

Electrical impedance scanning (EIS) is a new adjunctive diagnostic method for women breast cancer examination. In clinic research, we found some influencing factors which can induce a bad EIS imaging results. In order to analyze the influencing factors on EIS imaging and find the solutions, we set up an EIS workbench which can simulate the influencing factors that may happen in a clinic. We studied the influencing factors from size, depth of the target; the influence from the poor contact; the influence from the unparallel current field. The experiment results show that the detectability of EIS system is a function of the depth, the size and the area of electrodes; a good contact between the probe and the skin can decrease the artificial imaging; using the imaging algorithm can calibrate the imaging induced by unparallel current field

Character Analysis and Recognition of the Imaging in Electrical Impedance Scanning for Breast

A new post-processing algorithm was developed for EIS image in order to improve the accuracy of diagnosis. This algorithm automatically analyzes data and recognizes the light region in the EIS image basing on the data process criterions. The threshold criterion and the modality criterion were derived from the ideal saline-tank phantom experiment. And the filter criterion came from the analysis of 240 abnormal images. Filter criterion is first used to filter some influencing data in the algorithm process. Then the threshold criterion and the modality criterion are used to recognize the light region. In addition, the algorithm was verified on a test group including 540 EIS non-processed images. The performance obtained for this test group was an 8% increase of the accuracy. The algorithm provides a clear and objective interpretation for EIS recorded images.

Design of the softwares and circuits of a thermal-array used-in-medicine recorder

A thermal-array digital recorder based on the Intel 8031 microcontroller, which uses a fixed-line thermal printhead (TPH) and can record both real-time waveforms and alphanumeric data, is introduced. A 7-128 decoder circuit is used to realize the all-points-addressable control of the TPH. A monostable-driving-array circuit is designed to produce a minimum heating pulse for TPH. The method of interpolation is adopted to provide continuous waveform recording, and the internal timer of the Intel 8031 is used to provide the real-time recovered waveform recording for different sampling frequencies.<<ETX>>