Doppler Ultrasound Imaging Device Of The Dual-function Digital Signal Processing System Design

Ultrasound diagnosis, one of the four most important diagnosis means, is used in medical field. Ultrasound diagnosis equipments have much enormous progress during these years, owing to the same rapid progress in the field of the digital signal process, the ability of designing hardware and software, micro-electronics, mechanism and the material used in equipments. Among these, the digital B mode ultrasound equipment and the digital color ultrasound diagnosis equipment are emphasis direction. The design of the digital signal processing system is one of the difficulties.As same as color ultrasound diagnosis equipments, Duplex Doppler Ultrasonic Imaging Apparatus also obtains blood flow information through Doppler Effect. The distinctness is that color ultrasound diagnosis equipments use more signal processing techniques to obtain blood flow information and their images are colorful images. Thinking of the hugeness and the complexity of the system, in this paper, the design of the signal processing system of Duplex Doppler Ultrasonic Imaging Apparatus is proposed. It is of great significance to the design of the signal processing system of the color ultrasound diagnosis equipment.This paper introduced the frame of Duplex Doppler Ultrasonic Imaging Apparatus based on FPGA. And the design method of Field Programmable Gate Array is analyzed. The most important of all is our particular design of the digital signal processing system based on the theory of ultrasonic signal and mathematic derivation. It includes dynamic filter, amplitude demodulation, data compression, processing techniques in phase domain and frequent domain etc. And some modules are optimized for reducing resource used in FPGA. At last we indicated that the design is feasible and can reduce the complexity through the design and the simulation of important modules, At the same time, the system is excellent beacaue of digital techniques.Due to the hugeness and the complexity of the system,we only designed the system based on the theory of ultrasonic signal.However,it still has some theoretical and practical values for designing ultrasound diagnosis equipments,especialy for the digital color ultrasound diagnosis equipment.At the same time,it is valuable for engineers who engage in this field.