昆明理工大学附属医院/云南省第一人民医院 a. PET-CT中心；b. 肿瘤内科，云南 昆明 650500
Comparison of Setup Errors Between Fraixon System and Thermoplastic
Film in Radiotherapy Immobilization for Brain Malignancy
CHEN Yanga, WANG Shaoboa, LU Rencaia, WANG Siyua, LI Junlia, ZHENG Hongb, XIE Jiangb, HOU Lib
a. Center of PET-CT; b. Department of Oncology, The Affiliated Hospital of Kunming University of Science and Technology/
The First People’s Hospital of Yunnan Province, Kunming Yunnan 650500, China
Abstract：Objective To evaluate the positioning accuracy of Fraxion system and thermoplastic film in radiotherapy immobilization
for brain malignancies. Methods A total of 92 patients with brain malignancies (32 patients with Fraxion system and 60 patients
with thermoplastic film) who received head radiotherapy fixation in the Department of Oncology of our hospital from January 2018
to September 2022 were selected. The linear setting error and 3D vector displacement were obtained by matching the cone beam
volume tomography image with the planned computerized tomography image. According to the formula of margin of planning target
volume (MPTV), the MPTV of the planned target area was calculated, and the positioning accuracy of Fraxion system group and
thermoplastic film group was compared. Results The setup errors of the Fraxion system group and the thermoplastic film group were
(0.79±0.45) mm and (1.60±1.00) mm in the left-right directions (X axis), (0.82±0.46) mm and (1.77±1.07) mm in the superiorinferior
directions (Y axis), and (0.62±0.37) mm and (1.88±1.05) mm in the anterior-post directions (Z axis), respectively. The 3D
displacement vectors were (1.42±0.45) mm and (3.13±1.62) mm, respectively. The linear setup errors, 3D displacement vectors
of the Fraxion system group were smaller than those of the thermoplastic film group, and the difference was statistically significant
(P<0.001). The MPTV of the Fraxion system group and thermoplastic film group were 0.64, 0.66, 0.52 mm and 1.08, 1.12, 2.64 mm
in the X, Y and Z axis, respectively. Conclusion Fraxion system is better than thermoplastic film in the positioning accuracy for
radiotherapy of brain malignancy, and can accurately locate the target area.
陈洋a，王绍波a，鲁仁财a，王思宇a，李浚利a，郑虹b，谢耩b，侯黎b. Fraxion系统与热塑膜固定在脑恶性肿瘤
放疗中的摆位误差比较[J]. 中国医疗设备, 2024, 39(2): 70-74.
CHEN Yanga, WANG Shaoboa, LU Rencaia, WANG Siyua, LI Junlia, ZHENG Hongb, XIE Jiangb, HOU Lib. Comparison of Setup Errors Between Fraixon System and Thermoplastic
Film in Radiotherapy Immobilization for Brain Malignancy. China Medical Devices, 2024, 39(2): 70-74.
