1Establishing an Initial Electron Beam Model with Monte Carlo Simulation for a Single 6 MV X-ray Medical Linac Based on Particle Dynamics CharacteristicsZHAO Hong-bin, KONG Xiao-xiao, LI Quan-feng, LIN Xiao-qi, BAO Shang-lian47-54,662Retinal Prosthesis: A Potential Benefit for the BlindYANG Xiao-jie55-663Metabolic Induction of Lactic Acid Bacteria for Urea RemovalZHANG Su-ai, BAI Yu, LI Dong-xia, CHEN Bo-li, SONG Cun-jiang, QIAO Ming-qiang, KONG De-ling, YU Yao-ting67-774An Improved Fixed-point Algorithm for Independent Component Analysis of Functional MRI DataWENG Xiao-guang, WANG Hui-nan, QIAN Zhi-yu78-835An Improved Medical Image Fusion Algorithm for Anatomical and Functional Medical ImagesCHEN Mei-ling, TAO Ling, QIAN Zhi-yu84-926notice to contributors封3