1. Institute of Bismuth Science University of Shanghai for Science and Technology Shanghai 200093 China
2. Department of Research and Development & Department of Nuclear Medicine Shanghai Proton and Heavy Ion Center Fudan University Shanghai Cancer Center Shanghai 201321 China
3. Shanghai Key Laboratory of Radiation Oncology (20dz2261000) Shanghai 201321 China
4. Shanghai Engineering Research Center of Proton and Heavy Ion Radiation Therapy Shanghai 201321 China