Design Of Ultrasound Signal Processing Based On FPGA

Ultrasound beam has the characterastics of good directivity, strong penetratingability, no damage to human body, etc.Currently, as one of the four modern majormedical imaging equipment, ultrasound diagnostic apparatus has been widely used inclinical diagnosis applications.Compared with conventional ultrasound diagnosticapparatus, digital ultrasound diagnostic apparatus has outstanding advantages in aspectsof circuit integration, processing accuracy, image quality and processingspeed.Compared with foreign advanced technology, the key technology in digitalultrasound imaging and research in the field of engineering application are still a biggap, while the market demand for high-end ultrasound imaging diagnostic apparatus isincreasing year by year.So the study of the key technology of digital ultrasound imaginghas extremely important practical significance.This paper embarks from the digital signal processing principle of ultrasoundimaging, and the technology of digital signal processing based on FPGA is studied.Timegain control, dynamic filtering and digital scan conversion are carried out a detailedstudy design.The main contents include the following aspects:Research of time gain control technology: according to this system configuration,digital time gain control is selected and the compensation control with two levels isused in this system.This design is not only meets the ultrasound attenuationcompensation, but also realizes the controllable amplification functions, which has goodeffect in the amount of compensation, controllability and real-time in simulation results.Research of dynamic filtering technology: FIR filter based on the window functionis selected to calculate the filter coefficient, and the paralell distribited structure whichis based on partition table is used to design the filter.The dynamic filtering is realizedwith the function of filtering noise dynamically and effectively.Research of digital scan conversion algorithm: according to the actual situation ofthis system, combined with modified CORDIC algorithm in FPGA, digital scanconversion is realized with the methods of down-to-check the data address and circular arc interpolation, which meets the design accuracy at the same time greatly improvesthe real-time performance of system.Digital ultrasound signal processing front-end design of this paper improves thesignal quality effectively for imaging through the improvement of the signal processingalgorithm and achievement, which achieves the desired design requirements.Theresearch of this paper is of great signicance for research of ultrasound front-end signalprocessing algorithm and development of ultrasound diagnostic apparatus.