1. Image Processing Center Beihang University Beijing People's Republic of China
2. Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing People's Republic of China
3. Department of Physics Beihang University Beijing People's Republic of China
4. Center of Interventional Radiology & Vascular Surgery Department of Radiology Zhongda Hospital Medical School Southeast University Nanjing China
5. Department of Radiation Oncology Duke University Medical Center Durham North Carolina USA