Research And Implementation Of High Frequency Ultrasonic Three-dimensional Imaging System

Medical ultrasound imaging technology is widely used in clinical diagnosis because of its low cost,real-time imaging,safety and radiation-free.Three-dimensional ultrasound imaging can provide a three-dimensional structure of the tissue and organs to be tested,and facilitate understanding of the spatial structure and anatomical information of tissues and organs.High-frequency ultrasonic three-dimensional imaging technology can clearly display the subtle three-dimensional structure information of superficial organs such as skin because of its superior resolution,which has important research value.The high-frequency ultrasound three-dimensional imaging method proposed in this paper is to realize the three-dimensional structure display of the tissue to be tested under high-frequency ultrasound conditions,which is beneficial to the clinical diagnosis of superficial organs.In this paper,by analyzing the principle of three-dimensional ultrasound imaging,combined with the characteristics of high-frequency imaging,the acquisition method,reconstruction algorithm and visualization method of high-frequency ultrasound three-dimensional data are determined.Aiming at the disadvantages of high-frequency ultrasonic two-dimensional image equal time interval sampling,an equal spatial interval sampling mode suitable for high-frequency ultrasonic two-dimensional image data acquisition is proposed,which improves the quality of two-dimensional ultrasound image;in this paper,the scanning mode of mechanical linear three-dimensional scanning probe is controlled by FPGA to realize the preset scanning scheme and obtain high-frequency ultrasonic three-dimensional data.The three-dimensional reconstruction and visualization of the three-dimensional data is performed on the upper computer system based on the visual toolkit VTK to realize high-frequency ultrasonic three-dimensional imaging.This thesis builds an experimental platform for high-frequency ultrasound three-dimensional imaging system based on FPGA.The feasibility of the system was verified by high-frequency ultrasonic three-dimensional imaging experiments of ultrasonic phantoms.In order to improve the data utilization rate,this paper conducts interactive interactive experiments on high-frequency ultrasound three-dimensional images such as rotation,scaling and display of arbitrary cut surfaces.Aiming at the possible interference in the high-frequency ultrasonic three-dimensional data acquisition process,the image registration experiment was carried out,which effectively reduced the influence of the interference in the data acquisition process on the three-dimensional reconstruction result and improved the accuracy of the high-frequency ultrasound three-dimensional image.The high-frequency ultrasonic three-dimensional imaging system designed in this paper has the characteristics of high-frequency ultrasonic high-resolution and the advantages of three-dimensional ultrasound imaging.It lays an experimental foundation for the clinical diagnosis of superficial organs such as skin and has wide application value.