机构：[1]College of Physical Science and Technology (College of Nuclear Science and Engineering), Sichuan University, Chengdu, China,[2]Key Laboratory of Radiation Physics and Technology Ministry of Education, Chengdu, China,[3]Department of Medical Physics, Shanghai Proton and Heavy Ion Center, Shanghai, China,[4]Department of Radiation Oncology, Miami Cancer Institute Baptist Health South Florida, Miami, FL, United States,[5]Department of Nuclear Medicine, Shanghai Proton and Heavy Ion Center, Shanghai, China,[6]Department of Radiation Oncology, Shanghai Proton and Heavy Ion Center, Shanghai, China,[7]Department of Nuclear Medicine, Shanghai Proton and Heavy Ion Center, Fudan University Cancer Hospital, Shanghai, China
Purpose: Positron emission tomography (PET) scanning is a widely used method of proton therapy verification. In this study, a proton radiotherapy accuracy verification process was developed by comparing predicted and measured PET data to verify the correctness of PET prediction and was tested at the Shanghai Proton and Heavy Ion Center. Method: Irradiation was performed on a polymethyl methacrylate (PMMA) phantom. There were two dose groups, to which 2 and 4 Gy doses were delivered, and each dose group had different designed dose depths ranging from 5 to 20 cm. The predicted PET results were obtained using a PET prediction calculation module. The measured data were collected with a PET/computed tomography device. The predicted and measured PET data were normalized to similar PET amplitude values before comparison and were compared using depth and lateral profiles for the position error. The error was evaluated at the position corresponding to 50% of the maximum on the PET curves. The mean and standard deviation were calculated based on the data sampled in the scoring area. Gamma index analysis is also applied in the comparison. Results: In the depth comparison, the 2 and 4 Gy dose cases yielded similar mean depth errors between 1 and -1 mm, and the deviation was <2 mm. In the lateral comparison, the 2 Gy cases had a mean lateral error around 1 mm, and the 4 Gy cases had a mean lateral error <1 mm, with a standard deviation <1 mm for both the 2 and 4 Gy cases. All the cases have a gamma passing rate over 95%. Conclusion: The comparison of these PMMA phantom cases revealed good agreement between the predicted and measured PET data, with depth and lateral position errors <2 mm in total, considering the uncertainty. The comparison results demonstrate that the PET predictions obtained in PMMA phantom tests for single proton beam therapy verification are reliable and that the research can be extended to verification in human body treatment with further investigation.
基金：
This project is supported by Shanghai Municipal Commission of
Health and Family Planning (Grant number 201640196).
语种：
外文
PubmedID：
中科院(CAS)分区：
出版当年[2018]版：
大类|2 区医学
小类|3 区肿瘤学
最新[2023]版：
大类|3 区医学
小类|3 区肿瘤学
第一作者：
第一作者机构：[1]College of Physical Science and Technology (College of Nuclear Science and Engineering), Sichuan University, Chengdu, China,[2]Key Laboratory of Radiation Physics and Technology Ministry of Education, Chengdu, China,
通讯作者：
推荐引用方式(GB/T 7714)：
Junyu Zhang,Yan Lu,Wenchien Hsi,et al.Evaluation of Proton Therapy Accuracy Using a PMMA Phantom and PET Prediction Module.[J].Frontiers in oncology.2018,8:523.doi:10.3389/fonc.2018.00523.
APA：
Junyu Zhang,Yan Lu,Wenchien Hsi,Jiangang Zhang,Yinxiangzi Sheng...&Jingyi Cheng.(2018).Evaluation of Proton Therapy Accuracy Using a PMMA Phantom and PET Prediction Module..Frontiers in oncology,8,
MLA：
Junyu Zhang,et al."Evaluation of Proton Therapy Accuracy Using a PMMA Phantom and PET Prediction Module.".Frontiers in oncology 8.(2018):523
