| The ultrasonic diagnosis owns the so many advantages as it can resistdamage and be operated easily at low cost. The portable B-Mode UltrasonicMedical Instrument (BUMI) has become widely applicable in spot diagnosis ofsevere and acute disease, spot medical aid in disaster or war area due to itsfeatures of flexibility and portability. Therefore, the portable B-Mode UltrasonicMedical Instrument will have a valuable usage as well as a broad market.In such a background, this study analyzes the composition and the workingprinciple of the BUMI and designs the highly integrated front-end program,which builds the foundation for the development of the miniature of BUMI.This thesis determines a highly integrated front-end program firstly. Afterthese each part of the block diagram of front-end system is designed into materialcircuit in detail, mainly including connecting probe, transmitting control, T/Rswitch, echo receiving, the FPGA block circuits, clock network and power supplyblock. Second it introduces the principles of PCB design, including thedetermination of the layers, component arrangement and routing design. Underthe effective control of board size this study accomplishes10layers of PCB.Third it introduces the digital signal processing, which includes the transducersequencer, transmitting control, digital beam forming, dynamic filter, dynamicrange transform, time gain control, persistence, edge enhance and Gammatransform. Every part’s simulation is made based on FPGA, and the simulationresults are analyzed to verify the completion of the function. Finally, this thesisintroduces the system debugging basis on the five blocks, including the power,the clock, transmitting control, receiving control and the FPGA block. At last, thetest results are presented.In this paper, it can be seen that the design of front-end can greatly improveintegration on the basis of performance, reduce the volume of B-Mode UltrasonicMedical Instrument and improve the portability. |
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