Analysis of the Set-up Error of Two Prone Fixation Methods in Carbon Ion Radiotherapy
for Pancreatic Cancer
BU Ruirui1,2,3, ZHA Shanshan1,2,3, LI Yao1,2,3, YOU Dan1,2,3,4, ZHOU Dan1,2,3, MENG Lufang5, LI Yongqiang1,2,3
1. Department of Medical Physics, Shanghai Proton and Heavy Ion Center, Shanghai 201321, China;
2. Shanghai Key Laboratory of Radiation Oncology, Shanghai 201321, China;
3. Shanghai Engineering Research Center of Proton and Heavy Ion Radiation Therapy, Shanghai 201321, China;
4. Department of Radiophysics, Fudan University Shanghai Cancer Center, Shanghai 201321, China;
5. Library, Shanghai Institute of Technology, Shanghai 201418, China
Abstract：Objective To compare the set-up errors of the bellyboard position fixation method and the personalized prone position
fixation method including baseplate, vacuum cushion and body positioning thermoplastic in carbon ion radiotherapy for pancreatic
cancer, to provide reference for prone radiotherapy of pancreatic cancer. Methods A total of 80 patients received carbon ion
radiotherapy for pancreatic cancer were randomly selected, of which 40 patients were fixed with bellyboard position fixation
(bellyboard group), and 40 patients were fixed with baseplate, vacuum cushion and body positioning thermoplastic (vacuum cushion
group). Siemens kV-level X-ray imaging equipment was used to collect orthogonal field images of each patient in the front and
side positions. The image registration was performed with DRR images of positioning CT. The set-up error data in six dimensional
directions (left-right translation, head-foot translation, front-back translation, isocenter rotation, pitch rotation, and roll rotation)
were obtained and analyzed between two groups. Results The set-up errors in the vacuum cushion group were significantly lower
than those in the bellyboard group in the directions of left-right translation, head-foot translation, isocentric rotation, pitch rotation
and roll rotation, but the set-up errors in the front-back translation direction were greater than those in the bellyboard group, and
the differences were statistically significant (P<0.05). Conclusion In carbon ion radiotherapy for patients with pancreatic cancer,
the combination of baseplate, vacuum cushion and body positioning is generally better to the bellyboard. Using the combination of
baseplate, vacuum cushion and body positioning thermoplastic before radiotherapy, patient can no longer move at vertical direction
after the body positioning being buckled to reduce the error of front-back translation. The results can provide a reference for
radiotherapy in prone position for pancreatic cancer in the future.
步蕊蕊1,2,3，查珊珊1,2,3，里尧1,2,3，尤丹1,2,3,4，周丹1,2,3，孟露芳5，李永强1,2,3. 两种俯卧位固定方式在胰腺癌碳离子放疗中的摆位误差分析[J]. 中国医疗设备, 2023, 38(7): 73-79.
BU Ruirui1,2,3, ZHA Shanshan1,2,3, LI Yao1,2,3, YOU Dan1,2,3,4, ZHOU Dan1,2,3, MENG Lufang5, LI Yongqiang1,2,3. Analysis of the Set-up Error of Two Prone Fixation Methods in Carbon Ion Radiotherapy
for Pancreatic Cancer. China Medical Devices, 2023, 38(7): 73-79.
