| The ultrasonography diagnosis technology is safe,hurtless,convenient, adaptable,intuitionistic,flexible,inexpensive,and its merits also consists of legible display,repetitive examining,high veracity in diagnosis,and has the better ability to distinguish parenchyma.Nowadays,it has become the first choice technology of contemporary medical imaging diagnosis.Ophthalmology ultrasonography is a special equipment in ultrasonic diagnosis,which can be used to diagnose diseases of the detachment of the retina,the tumour in entoptic and orbital cavity,the opacity and hemorrhage in vitreous body,the eyeground disease and the intraocular foreign body.In recent years,with the rapid development of the digital signal processing,the hardware and software design capabilities,as well as the aspects of materials science and so on,the ophthalmology ultrsonography has made great progress in a number of areas,in which the digital ophthalmology ultrasonography is a focus of the development.This paper is started with the theory and design of the ultrasonography,described the hardware and software structure of the system in emphasis.At the same time,each sub-block that used to digitally process ultrasonic signals has been introduced. Combined with the characteristics of a variety of digital signal processing methods, we also have made a brief introduction of the structure characteristics,the programming theory,and the design process of the Field Programmable Gate Array. On this basis,we have discussed the design of the FIR filter and to be realized on FPGA,which has applied to each sub-block for signal processing.Lastly,by building some physical simulation model,the validity of each phases in signal processing of the system has been validated.By detecting normal human eyes and orbits,the echo signals gained are all right.The system has good ability to process high frequency ultrasonic echo signals of ophthalmology in real time.It has reached design demands, and shows a good application prospect. |
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