Application of Dynamic Jaw Technique in Helical Tomotherapy During
Stereotactic Body Radiotherapy for Lung Cancer
WU Junxiang, TANG Bin, KANG Shengwei, WANG Pei, LI Jie, WU Fan
Key Laboratory of Radiation Oncology of Sichuan Province, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center,
School of Medicine, UESTC, Chengdu Sichuan 610041, China
Abstract：Objective To evaluate the plan quality and execution efficiency of dynamic jaw and investigate the feasibility of
replacing the fixed jaw 2.5 cm (FJ2.5) with dynamic jaw 5.0 cm (DJ5.0) in stereotactic body radiotherapy (SBRT) of lung
cancer. Methods A total of 10 patients with lung cancer were selected with a prescription dose of 40 Gy/5 times. Under the same
optimization conditions, FJ2.5, dynamic jaw 2.5 cm (DJ2.5) and DJ5.0 were used for plan design and evaluation, respectively. The
difference for D95, conformity Index (CI), gradient Index (GI), dose to OARs, monitor unit and beam-on time were compared among
these 3 techniques. Results DJ2.5 plan was better in the aspects of the GI (P<0.05). DJ2.5 plan were superior to DJ5.0 and FJ2.5
plans in the aspects of the V5, V10 and Dmean to the ipsilateral lung, the Dmean to the contralateral lung, the Dmax to the spinal cord, the
Dmean to heart and the Dmean to esophagus (P<0.05). Compared with FJ2.5 plan, the V5, V10 and Dmean to the ipsilateral lung of DJ5.0
plan were superior (P<0.05). Compared with FJ2.5 and DJ2.5, the monitor unit of DJ5.0 was decreased by 37.0% and 40.7%, and the
beam-on time was decreased by 34.5% and 37.9%, respectively (P<0.05). Conclusion Taking the planning quality and irradiation
efficiency into consideration, it is suggested to use DJ5.0 group instead of traditional FJ2.5 for SBRT of lung cancer, which can
significantly shorten the irradiation time while meeting the clinical requirements. If only the planning quality is considered, the DJ2.5
group should be selected.
吴骏翔，唐斌，康盛伟，王培，黎杰，吴凡. 螺旋断层动态钨门技术在肺癌立体定向放疗中的应用[J]. 中国医疗设备, 2022, 37(4): 43-46.
WU Junxiang, TANG Bin, KANG Shengwei, WANG Pei, LI Jie, WU Fan. Application of Dynamic Jaw Technique in Helical Tomotherapy During
Stereotactic Body Radiotherapy for Lung Cancer. China Medical Devices, 2022, 37(4): 43-46.
