Medical Ultrasonic Data Acquisition And Processing Analysis System Based On FPGA

Ultrasonic medical imaging is one of the most widely used medical imaging technologies,with the characteristics of safety,rapidity,and rich functions.The study of ultrasonic medical imaging system is of great significance to the development of medical imaging.At present,ultrasonic diagnostic equipment is developing in the direction of better real-time performance and higher image quality.The key lies in the system design based on FPGA ultrasonic front-end,which directly affects the imaging efficiency and imaging quality of the entire system.However,there are still many problems with ultrasound systems,mainly including complicated beam synthesis control,low imaging frame rate,and poor imaging results.To deal with these problems,this article mainly carried out research from the following three aspects:(1)In the stage of beam synthesis,aiming at the problems of complex control and excessive parameter storage resources in the traditional beam synthesis dynamic focusing process,a DDR parameter optimization control scheme is proposed.Through the combination of the host computer and DDR,the process of parameter calculation and control is simplified,and sufficient RAM resources within the FPGA are ensured,thereby improving system stability.(2)In the stage of signal processing,in order to reduce the amount of image data to make the host computer perform faster image processing operations and higher imaging efficiency,the echo data was log-compressed,and a fractional decimation filter was designed to reduce the amount of data uploaded by the FPGA.(3)In order to improve the image frame rate of the system,the multi-beam technology is adopted in the echo receiving stage,which greatly increases the image frame rate.Further,line composite and weak focus imaging techniques are adopted to solve the image distortion problem in multi-beam reception,thus improving the image quality.By comparing the simulation result of each module and the image data collected by the instrument in real time,the results show that the dynamic focus parameter optimization scheme based on DDR can fully realize the dynamic focus function,and optimize the calculation and control process,reducing the use of RAM resources;The fractional decimation filter can accurately obtain the required amount of data and reduce the data rate of the image;The simultaneous use of multi-beam and weak-focus imaging technology improves the frame rate of the image and improves the overall image quality.