Key Techniques And Experimental Study Of X-ray Imaging System Based On Embedded System

It has been more than100years since German physicist Rontgen discovered X-ray, andmedical X-ray imaging systems became popular devices in medical diagnosis. With thedevelopment of embedded technology, people are trying to combine digital imaging and X-rayimaging and then digital imaging will completely replace film.In this paper, some theoretical and experimental research was done in order to solve somekey technology about digital X-ray imaging system, such as embedded control of X-raygenerator, X-ray imaging system of multiple light cone coupling, embedded softwareprogramming, X-ray image processing. Some valuable results for portable and digital X-raydevice are obtained. In general, research works involved in this paper can be included asfollowing aspects.1. The significance of this research were presented. Through the analysis of the currentdevelopment of medical X-ray machine and embedded technology, the overall scheme of thisproject were developed.2. Through the analysis on the design of high voltage circuit based on the technique of highfrequency reverse-transformation and filament-supplied-electricity circuit, the embedded controlscheme of X-ray generator was developed. And the circuits of the control to X-ray generator andthe acquisition of feedback signal were designed. It can realize the real-time and accurate controlto X-ray from X-ray generator.3. The multiple optical-taper coupling’ X-ray digital imaging system was designed andconstructed. Fluorescence powder, optical fiber-taper, and CMOS used in this system wereselected by the analysis to the characteristics of them. Through the calculation and analysis onthe coupling efficiency of each part of the digital imaging system, the efficient coupling processwas worked out. And the focusing method based on operator fusion in this system for couplingoptical-taper with CMOS was researched and designed. In summary, the efficient and accuratedigital acquisition for X-ray was completed.4. The transplantation of WINCE system to experimental embedded ARM9platform wascompleted. And the software of digital X-ray machine on WINCE system were developed byEVC platform. Then the human-computer interaction module was designed.5. The methods of extraction and mosaic for the available image from four opticalfiber-taper coupling imaging system was designed. According to the X-ray image quality,adaptive median filter algorithm was improved, and a medical image enhancement method basedon human eye visual property was proposed, These method enhanced the clarity and recognizability of X-ray image. Finally, the X-ray digital imaging system in this paper wasverified in experiment.