Hardware System Design For Medical Ultrasound Imaging

With the continuous expansion of application scenarios and demands of medical ultrasound imaging equipment,the miniaturization,portability and diversification of application scenarios of high-performance medical ultrasound equipment have broad prospects for development.The thesis researches and designs a portable medical ultrasound imaging hardware system with 128 channels transmitting and 64 channels receiving,including the design of circuit board and FPGA digital control module.Firstly,combined with the hardware system design requirements,highly integrated high voltage pulse transmitters,ultrasound receivers and system-in-package power managers are used to design the hardware system for reducing the board size and power consumption.With simulation tools such as Hyper Lynx and ADS,the post-simulation analyses of the high-speed digital signal integrity in the PCB and the power integrity of the FPGA core are carried out.The signal integrity simulation results show that DDR2 module can reach the transmission rate of800MT/s,and the PCB link insertion loss of JESD204 B high-speed serial bus is only-1.1d B at the 6GHz frequency point,which can meet the requirement of 6Gbps transmission rate.The power integrity simulation results show that the superposition of DC voltage drop and AC noise can be within the FPGA core power supply fluctuation tolerance.Secondly,the FPGA digital control module is designed,and the functional simulations of TX7332 pulse transmitter control module,AFE58JD32 analog receiver configuration module,and DDR2 read-write module are carried out.The functional simulation results preliminarily verify the correctness of the FPGA digital control logic design.Finally,the FPGA digital control logic is debugged and verified at the board level on the existing 64-64 channels hardware experimental board designed by our laboratory.The SPI data writing and reading loopback experiments are carried out on the internal registers of the TX7332 and AFE58JD32.And the actual performance of the TX7332 pulse transmitter and the AFE58JD32 ultrasound receiver under the control of FPGA is tested.All test results show that the FPGA digital control module can correctly control TX7332 and AFE58JD32 to realize bipolar pulse transmission and ultrasonic echo reception.