An Improved High-Accuracy CORDIC Algorithm for DSC in Endoscopic Ultrasonography System
An Improved High-Accuracy CORDIC (Coordinate Rotation Digital Computer) algorithm for digital scan conversion is presented in this paper to enhance the accuracy and speed of coordinate conversion for Endoscopic Ultrasonography. Several optimization methods are carried out to make coordinate conversion implemented more exactly with fewer resources of FPGA. In the paper, the Cartesian coordinates are redemarcated to save LE (Logic Element) resources of FPGA. The bit width of data, the scale factor correction and the convergence range are all optimized to improve the accuracy of the algorithm. Further more, a special processing for the near-field data is carried out to reduce the errors of digital scan conversion. With a full pipeline structure implemented on FPGA, the Improved High-Accuracy CORDIC algorithm is validated by both simulation and real-time ultrasound imaging experiment, making the accuracy enhanced and the image quality improved.
Ultrasonic Endoscope Digital Scan Converter Improved High-Accuracy CORDIC Algorithm FPGA
Yan Li Yunxia Hao Ming Li Yi Wang Xiaodong Chen Daoyin Yu
College of Precision Instrument & Opto-electronic Engineering, Tianjin University, Opto-electronic Information Science and Technology Laboratory, Ministry of Education, Tianjin 300072,China
国际会议
合肥
英文
37-40
2011-09-23（万方平台首次上网日期，不代表论文的发表时间）