1. School of Radiology, The Second Affiliated Hospital of Shandong First Medical University, Taian 271016, China
2. School of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Taian 271000, China
3. Key Laboratory for Liquid−Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
4. School of Materials Science and Engineering, Shandong University, Jinan 250061, China