Yonghua Bi1, Xinwei Han2, Ke Xu3. 1. Department of Interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, ChinaDepartment of Radiology, The First Affiliated Hospital of China Medical University, Shenyang, China. 2. Department of Interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China. 3. Department of Radiology, The First Affiliated Hospital of China Medical University, Shenyang, China.