Study of Effects on Setup Accuracy of Optical Surface-Guided DIBH Radiotherapy for Left
Breast Cancer Patients Positioned with and Without CT-Side Optical Equipment
WU Hegou, ZHONG Heli, ZHANG Guangwei, LIU Jianfeng, YANG Junguo, SU Xiaohui
Department of Radiation Oncology, Shenzhen People’s Hospital (The Second Clinical Medical College of Ji’nan University,
The First Affiliated Hospital of Southern University of Science and Technology), Shenzhen Guangdong 518020, China
Abstract：Objective To investigate the effect of positioning without CT end optical device and positioning with CT end optical
device on the precision of radiotherapy placement during optical surface-guided deep inspiration breath-hold (DIBH) radiotherapy
on left breast cancer. Methods A total of 60 patients diagnosed with left breast cancer were selected, 30 of them were guided to
implement DIBH radiotherapy (group D0) through the optical surface monitoring system OSMS (AlignRT) after the positioning
of DIBH without CT-side optical equipment; the other 30 patients were treated with Catalyst guided DIBH radiotherapy (group
D1) after the location of DIBH was assisted by the Sentinel CT-side optical device. The positioning procedures of the two groups
were compared, and the error data of six dimensions after CBCT registration in the first radiotherapy position of the two groups
were analyzed. Results The absolute values of CBCT registration errors in x, y, z and Rx, Ry and Rz directions were (0.15±0.11),
(0.17±0.12), (0.20±0.14) cm and (0.77±0.71)°, (0.60±0.60)° and (0.66±0.62)°, respectively. Group D1 was (0.13±0.08),
(0.13±0.09), (0.20±0.11) cm, (0.61±0.57)°, (0.50±0.52)°, (0.61±0.46)°, respectively, and there was no significant difference in
registration data between the two groups (P>0.05). Conclusion Positioning of left breast cancer DIBH radiotherapy guided by optical
surface can be achieved accurately without CT-side optical device or with CT-side optical device, and there was no statistically
significant difference in CBCT registration error between the two methods.
吴何苟，钟鹤立，张光伟，刘剑锋，杨俊国，苏小慧. 有无CT端光学定位设备对光学表面引导的左侧乳腺癌DIBH放疗摆位精度影响的研究[J]. 中国医疗设备, 2023, 38(1): 48-52.
WU Hegou, ZHONG Heli, ZHANG Guangwei, LIU Jianfeng, YANG Junguo, SU Xiaohui. Study of Effects on Setup Accuracy of Optical Surface-Guided DIBH Radiotherapy for Left
Breast Cancer Patients Positioned with and Without CT-Side Optical Equipment. China Medical Devices, 2023, 38(1): 48-52.
