Stability Analysis of Active Breathing Coordinator and Respiratory
Gating in Particle Therapy of Lung Cancer
XIE Wenbo1,2,3, 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 200032, China;
3. Shanghai Engineering Research Center of Proton and Heavy Ion Radiation Therapy, Shanghai 201321, China
Abstract：Objective To determine active breathing coordinator (ABC) and respiratory gating (RG) stability in particle therapy for
lung cancer. Methods A total of 40 cases of lung cancer using two techniques were selected, 20 cases used ABC and 20 cases used
RG. Comparison of tumor displacement values between scanning and reconstruction CT images in deep inspiration holding state and
positioning CT images in the same state for cases using ABC; RG was used to select average CT images in time phase reconstruction
from 20% at the end of expiratory breath to 20% at the beginning of inspiration. The tumor displacement values were compared with
the time reconstructed location CT images from 20% at the end of expiratory breath to 20% at the beginning of inspiratory, and the
data were analyzed by test. Results Using ABC and RG, the mean absolute error in the head and foot direction of tumor displacement
was (0.10±0.04) cm vs. (0.34±0.17) cm, P＜0.001. The dispersion was (0.08±0.03) cm vs. (0.23±0.15) cm (P<0.001). The V95
dispersion of planning target volume was (1.95%±1.3%) vs. (0.61%±0.45%) (P=0.015). Conclusion In the particle therapy of
lung cancer, head/foot orientation stability using ABC is superior to gating technique, and ABC has more advantage in dosimetry.
谢文波1,2,3，李永强1,2,3. 在肺癌粒子治疗中主动呼吸控制技术与
呼吸门控技术头脚方向稳定性分析[J]. 中国医疗设备, 2023, 38(12): 80-84.
XIE Wenbo1,2,3, LI Yongqiang1,2,3. Stability Analysis of Active Breathing Coordinator and Respiratory
Gating in Particle Therapy of Lung Cancer. China Medical Devices, 2023, 38(12): 80-84.
