Study On Technologies And Optimization Of Digital B-mode Ultrasound Imaging

At present, medical ultrasound imaging technology has been recognized with the X-ray diagnostic techniques, isotope radiation diagnostic techniques as the three modern medical imaging technology. The size of ultrasound wavelength is the same as a biological cell. When interact with biological tissue it can obtain more information than the X ray. Ultrasound imaging principle decided that the imaging can be dynamic, repeated. Using the physical characteristics of ultrasound that it spread in human body, can show images of the inside organs or diseases, so some diseases can be diagnosed accordingly. Because it is simple, safe, fast, no pain and no measuring in accumulation. These advantages causes a wide range of clinical applications. Many parts of the body and internal organs such as eye, thyroid, breast, cardiovascular, liver, gallbladder, chest film, spleen, urinary system, as well as maternity and so on ultrasound detection have demonstrated its great value.In China, the information of medical ultrasound imaging algorithm research is not much. Most information is mainly related to medical ultrasound technology. There is a small part is on the principles of medical ultrasound introduction and system design. The modern medical ultrasound imaging algorithms directly determines not only the system's structural design, but also the quality of imaging systems. So The lack of algorithm in the ultrasound imaging research causes the designed capability of medical ultrasound equipment clearly insufficient. Therefore, as soon as possible to come up a new and efficient imaging algorithms, will significantly increase the overall quality of domestic medical ultrasound equipment.The purpose of this paper is researching the medical ultrasound imaging algorithms based on the laboratory-developed high-definition digital B-mode ultrasound imaging system. The paper researches the basic principles of digital B-mode ultrasound imaging system, the basic knowledge of ultrasonic signals, digital beam synthesis technology, echo signal processing technology, digital image processing technology. The understanding of the most technologies is strengthened by simulation in the Matlab. As no documents relayed to sub-dynamic apodization and dynamic aperture in digital beam synthesis technology, after researching the Sidelobe level, beam distribution and width of ultrasound, we propose the creative algorithms in sub-dynamic apodization technology and dynamic aperture technology. The algorithm is proved feasibly and superiority in digital B-mode ultrasound imaging system by the Matlab and the ultrasound simulation program, Field II, and improve the image quality of the system.