Design And Research Of Signal Acquisition Circuit For Flat Panel Detector

Globally,various diseases caused by air pollution and industrialization are increasing.According to statistics of the World Health Organization in 2017,8.8 million people die of cancer every year in the world,and most of the deceased live in low and middle-income countries or in remote mountain areas.Moreover,the incidence of cancer has a rising trend,and the age also tends to be much younger.As early as 1985,the World Health Organization clearly stated that "a third of cancers can be prevented or even cured." The earlier a cancer patient discovers,the more likely he is to be cured.Therefore,"early detection,early diagnosis,early treatment"is the key to cure cancer completely.Currently there are many digita,l medical and imaging equipments to inspect cancer,including CT,FPD,and MR.However,CT,MR and other equipments with a large amount of radiation are expensive.technically complex,,and are not convenient to carry,so it is difficult to achieve large-scale popularization.However,FPD has the advantages of small size,light weight and easy to carry.If FPD can be used on a large scale,this will make many people,especially who live in relatively backward economies and people in remote areas have early cancer-screening and prevented opportunities,which is of great significance for the early detection and treatment of cancer.Based on lacking portable high-perf-ormance detectors for digital medical imaging.This paper is based on the amorphous silicon sensor array panel designed and developed by Prof.Huang Huiliang of the State Key Laboratory of Micro and Nanolabrication Technology at Shanghai Jiao Tong University.The design can read the acquisition circuit sensed by the sensor array panel.Through amplification,filtering and analog-to-digital conversion of the collected analog signals,low-noise,high-precision digital signals and high-resolution,high-noise-to-noise medical images are obtained.The system enables to screen and diagnose mammary glands of the women,the human heart,liver,lungs and 1.Introduced the research background and significance of the subject,analyzed the status quo of digital medical imaging system at home and abroad,finally introduced the type of flat panel detector.The main work of this thesis includes:1.FPD hardware structure design,including chip selection,hardware schematic design,PCB design and component layout.The design of the hardware schematic mainly includes the power supply part,the drive circuit part and the SD card storage module.2.Use Verilog hardware description language to implement FPGA control of the signal acquisition board and store and process the collected signals.Through ISE software and Modelsim software to compile,synthesis and simulation to verify the correctness of the code.3.Verify that the code and circuit design meet the initial requirements by performing functional verification on the PCB hardware after software simulation.