An Improved High-Accuracy CORDIC Algorithm for DSC in Endoscopic Ultrasonography System

Abstract:

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 re-demarcated 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.

• Periodical: Applied Mechanics and Materials (Volumes 130-134)
• Pages: 37-40
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.130-134.37
• Online since: October 2011
• Authors: Yan Li, Yun Xia Hao, Ming Li, Yi Wang, Xiao Dong Chen, Dao Yin Yu
• Keywords: Digital Scan Converter, Field-Programmable Gate Array (FPGA), Improved High-Accuracy CORDIC Algorithm, Ultrasonic Endoscope

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