1. Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China
2. University of Chinese Academy of Sciences Beijing100049 China
3. College of Physical Science and Technology (College of Nuclear Science and Engineering) Sichuan University Chengdu China
4. Department of Nuclear Medicine, Shanghai Proton and Heavy Ion Center Fudan University Cancer Hospital Shanghai China
5. Department of Medical Physics Shanghai Proton and Heavy Ion Center Shanghai China
6. Shanghai Key Laboratory of Radiation Oncology (20dz2261000) Shanghai China
7. Shanghai Engineering Research Center of Proton and Heavy Ion Radiation Therapy Shanghai China