Rearch Of System Design For Lung Cancer Breath Detection

As a serious threat to human health, Lung cancer leads to a low survival rate because of its late accurate diagnosis, its early detection is very significant. In this article, the methods on breath detection in medicine, especially on lung cancer detection were summarized. An early detection system for lung cancer breath is designed according to the identification mechanism of the porphyrin sensor array to gas and a spectral detection method.The breathing gas is first pumped into the reaction chamber, and then images of the sensor array before and after reaction with the gas are collected with the CMOS camera. Next, the color change of the sensor array is obtained through image processing, and the detection results are compared to the records in the database finally. The detailed work are listed as follows:â‘ Based on the functional requirements of the lung cancer breath detection system, the structure of the hardware is designed with modular design. As a host computer, Micro-PC controls the working process; As the next-bit machine, PIC16F877A works with Micro-PC to control external modules to complete system function. Peripheral modules includes mini-pump driver module, monitoring module detecting the conditions (temperature, flow, humidity) of the reaction chamber, the LED driver module providing light source and the USB communication module.â‘¡According to the timing diagram of the core components in the peripheral module, their control programs are completed with MPLAB, including micro-pump speed control program, reaction conditions acquisition program and the USB communication program. The main control program of PIC microcontroller was designed on the basis of the workflow of the detection system.â‘¢The chamber model is designed and the gas flow in the chamber is simulated with FLUENT. The simulation results are given and compared, then the gas chamber is determined.â‘£The sub-module hardware is tested one by one, and then nine lung cancer breath are detected by the assembled system and its function is confirmed.Finally, the research is summarised and evaluated, and the plan to improve and polish the system is proposed.