First Clinical Academy of Medical College of Xiamen University, Xiamen Zhongshan Hospital, Xiamen 361004,China;
First Clinical Academy of Medical College of Xiamen University, Xiamen Zhongshan Hospital, Xiamen 361004,China;
Medical Imaging Department, First Affiliated Hospital,Kunming Medical College, Kunming 650032, China;
Joints, atlantoaxial; Tomography, X-ray computed; Image processing, Computer-assisted;