Optimal Design And Implementation Of Key Parts Of Fully Digital Ultrasonic Imaging System

In the medical diagnosis, ultrasonic imaging technology not only has the advantages of noninvasive, no ionizing radiation, simple, cheap, etc, but also has the diversity of diagnosis parameters and the flexibility of project implementation. With the development of ultrasonic imaging technology, since the1990’s, ultrasonic imaging system of fully digital technology has been developing and mature. A basic characteristic of digital ultrasonic imaging system is to use digital circuit to realize the very large number of ultrasound real-time processing. Along with the fast development of the digital chip and high-speed processor, especially the high performance and quality of dealing with large data of FPGA, the ultrasonic real-time processing is more relied on the FPGA technology. Now, FPGA has become a powerful solution of digital signal processing, so in this paper, the optimization design of the ultrasonic imaging system is mainly aimed at the FPGA realization process.This paper starts from the two problems that digital ultrasonic imaging system urgently to be solved:First, improve the imaging resolution, contrast and frame frequency of the ultrasonic imaging system; Second, realize the miniaturization and low power of the ultrasonic imaging system. Based on the original digital ultrasonic imaging system in our laboratory with the ARM, linux system for real-time control, the implementation of algorithms with DSP and FPGA, we proposed the solution of optimization design of the beamformer and dynamic filter. In this paper, we first proposed the optimized MV algorithm on the basis of traditional MV algorithm, and then combined with the plane wave transmission method to realize the goals of improving the imaging resolution, contrast and frame frequency. Secondly, in light of the characteristics of FPGA structure and performance, on the basis of the original DA algorithm, an optimized DA algorithm is proposed, provided a theoretical basis for the miniaturization and low power consumption of the ultrasonic imaging system. Finally, On the basis of the original fully digital ultrasonic imaging system, combining with the above optimized algorithm, we completed the optimization design of the beamformer and dynamic filter with FPGA.