Design And Implementation Of The Froni End Of Pocket-sized Ultrasound Imaging Systems Based On ZYNQ

Ultrasound imaging has many advantages because it is non-destructive,dynamic,easy to implement and so on.Thus,it is promising to apply ultrasound imaging to many fields like tele-medicine and military use.High-integrated and low power chips make it possible to implement pocket-sized ultrasound imaging systems.Nowadays,pocket-sized ultrasound imaging systems tend to be wireless and user-friendly.The pocket-sized ultrasound imaging systems are developing extremely fast,but the technique to design and implement their front ends is still under development.With this background,this project successfully designes and implements the front end of a pocket-sized ultrasound imaging system.The system can both reduce the price of the ultrasound imaging systems and accumulate developing experience and technique basis for the localization of pocket-sized ultrasound imaging systems.This project designed and implemented the data acquisition hardware and signal processing alogrithms of a 32-channel pocket-sized ultrasound imaging system's front end.Based on the functions of the system and related references,ZYNQ,HDL6M06531 and MAX2082 are selected as the core chips of the whole system,Wi-Fi is selected to transport its data and its charging mode is wireless.Meanwhile,resolution ratio,size and system power comsumption are chosen as the performance criteria of the whole system.Based on these selected core chips,the schematic diagrams of transducer sequencer,MAX2082 circuits,ZYNQ circuits and power supply circuits are designed.According to the rules of design,layers and location,8-layer core circuits are designed.Ultrasound signal processing algorithms like transducer sequencer,electronic focusing,digital beam forming and digital demodulation are implemented using FPGA in turn.State machine is used to connect those algorithms mentioned above to build a complete ultrasound imaging system alogrithms.The procedure and simulation results of these algorithms are given and the simulation results are also analyzed.The hardware circuit parts of the whole system like power supply circuit,ZYNQ,HDL6M06531 and MAX2082 are debugged according to their functions and working orders and the debugging results are the same as those of anticipation.Digital beam forming,digital demodulation,transducer sequencer,electronic focusing and state machine are debugged with the order that receiving process precedes transmitting process.The front end of the pocket-sized ultrasound imaging system in this paper can both guarantee its image quality and minimize its size.It improves the integration level and stability of ultrasound imaging devices.By optimizing ultrasound signal processing algorithms and decreasing the power comsumption of the whole system,it shows new light on development and implementation of the multi-channel and multi-function wireless pocket-sized ultrasound imaging systems.