1. Department of Radiotherapy Oncology, Changzhou No.2 People's Hospital, Nanjing Medical University, Changzhou, Jiangsu, China
2. Jiangsu Province Engineering Research Center of Medical Physics, Changzhou, Jiangsu, China
3. Medical Physics Research Center, Nanjing Medical University, Changzhou, China
4. Key Laboratory of Medical Physics in Changzhou, Changzhou, China
5. Department of Ultrasound, Changzhou No.2 People's Hospital, Nanjing Medical University, Changzhou, Jiangsu, China