1. Department of Medical Imaging , Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250014 , China
2. Department of Medical Imaging , Shandong Provincial Hospital, Jinan, Shandong 250014 , China
3. Department of Medical Imaging , Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250014 , China
4. School of Life and Environmental Sciences , Guilin University of Electronic Technology, Guilin 541004 , China