Preliminary comparative study of active breathing coordinator and free breathing combined with bodyfix fixation device in stereotactic radiotherapy of thoracic tumors
10.3760/cma.j.cn113030-20201212-00613
- VernacularTitle:主动呼吸控制与自由呼吸配合bodyfix固定装置用于胸部肿瘤SBRT对比研究
- Author:
Wei YING
1
;
Dekang ZHANG
Author Information
1. 四川省肿瘤医院放疗中心，成都 610041
- Keywords:
Active breathing coordinator;
Free breathing;
Bodyfix fixation device;
Setup error
- From:
Chinese Journal of Radiation Oncology
2021;30(7):717-720
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the difference between active breathing coordinator (ABC) technique and free breathing (FB) mode combined with bodyfix stereotactic radiotherapy (SBRT) for chest tumors.Methods:40 thoracic tumor patients receiving SBRT were randomly selected and divided into the ABC technique group and FB model group. After fixation with bodyfix fixing devices in two groups, cone-beam CT (CBCT) scan images before each SBRT were matched with the plan reference images. The setup errors in the left-right (LR), superior-inferior (SI) and anterior-post (AP) directions were obtained. Then, the setup errors were corrected. SBRT was performed and split intra-fraction CBCT was conducted simultaneously, which was repeated until the end of treatment.Results:In the ABC technique group, the setup errors in the LR, SI and AP directions were (0.25±0.21) cm, (0.28±0.21) cm, and (0.21±0.24) cm, significantly less compared with (0.31±0.22) cm, (0.32±0.21) cm and (0.37±0.23) cm in the FB model group (all P<0.05). The V 30Gy of the heart, the V 20Gy and V 30Gy of the lung in the ABC technique group were significantly less than those in the FB model group (0.31%∶7.35%; 24.5%∶32.9%; 19.5%∶25.8%, all P<0.05). Conclusions:ABC technique combined with bodyfix fixation device may be superior to FB mode in SBRT for chest tumors, which remains to be validated by subsequent studies with large samples.
