Application of Active Breathing Coordinator Combined with Optical Surface Monitoring in
Breathing Training of Deep Inspiration Breath-Hold Radiotherapy for Left Breast Cancer
LI Tantan, QIN Shirui, LI Xiufen, LI Wei, ZHANG Jianghu, SONG Yongwen, HUAN Fukui, TANG Yu
Department of Radiotherapy, Cancer Hospital Chinese Academy of Medical Sciences, Beijing 100021, China
Abstract：Objective To investigate the feasibility and range of optical surface monitoring of deep inspiration breath-hold (DIBH),
under active breathing coordinator (ABC) in left breast cancer DIBH radiotherapy, and to compare the dosimetry difference between
the two respiratory states. Methods A total of 15 patients with left breast cancer who were to receive whole breast radiotherapy after
breast-conserving surgery were treated with an ABC device to control the inspiratory volume of the patients, and an optical surface
monitoring device was used to monitor the changes in the respiratory amplitude of the patients. CT images were collected at the state
of free breathing (FB) and 80% of the maximum inspiratory volume, respectively. Planning and design were carried out on two sets
of images by using Pinnacle planning system. Paired t test was conducted for the difference between the two states of double lung
volume and the threshold of ABC inspiratory volume on the CT image. The ratio of DIBH amplitude to the maximum breathing
amplitude on the optical body surface were calculated, and the percentage of optical body surface amplitude decreased by more than
3 mm when the DIBH was controlled by ABC to show that the inspiratory volume did not change. Dosimetry differences between
the two respiratory states were compared. Results There was no significant difference between volume difference of the two lungs
and the ABC inspiratory volume threshold on the CT images of 15 patients with FB and DIBH (P>0.05). The 80% average maximum
inspiratory volume range was 12.1 mm, and the 95% CI was (11.4~14.1) mm. The ratio of 80% maximum inspiratory volume to
maximum inspiratory volume was 0.78±0.12, and the ratio of 80% maximum inspiratory volume to FB volume was 3.24±1.08.
DIBH using ABC control showed no change in inspiratory volume, the optical body surface amplitude decreased by more than 3 mm,
accounting for 10.8%. The mean cardiac dose, V10, V20, average dose to the left lung, and total lung V20 were all significantly reduced
compared with FB (P<0.001). Conclusion It is effective to use optical body surface monitoring to achieve high quality DIBH in left
breast cancer postoperative radiotherapy.
李谭谭，覃仕瑞，李秀粉，李伟，张江鹄，宋永文，郇福奎，唐玉. 主动呼吸控制结合光学体表监测在左侧乳腺癌深吸气屏气放疗呼吸训练中的应用[J]. 中国医疗设备, 2021, 36(4): 141-144.
LI Tantan, QIN Shirui, LI Xiufen, LI Wei, ZHANG Jianghu, SONG Yongwen, HUAN Fukui, TANG Yu. Application of Active Breathing Coordinator Combined with Optical Surface Monitoring in
Breathing Training of Deep Inspiration Breath-Hold Radiotherapy for Left Breast Cancer. China Medical Devices, 2021, 36(4): 141-144.
