Clinical application of optical surface monitoring system in radiotherapy after radical mastectomy for left breast cancer
10.13491/j.issn.1004-714X.2023.01.009
- VernacularTitle:OSMS在左侧乳腺癌根治术后放疗中的临床应用
- Author:
Bei KUANG
1
;
Zhongqiang LIU
1
;
Hui WANG
1
;
Zhenming WU
1
;
Xiqu YE
1
;
Gengxian LIN
1
Author Information
1. Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou 510515 China.
- Publication Type:Journal Article
- Keywords:
Optical surface monitoring system;
Left breast cancer;
After radical surgery;
Automatic positioning;
Setup error;
Expanding margin
- From:
Chinese Journal of Radiological Health
2023;32(1):40-45
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the setup error under deep inspiration breath hold (DIBH) guided by optical surface monitoring system (OSMS) and free breathing (FB) FB1 and FB2 (without OSMS guidance, directly set up the body marker line by laser lamp) in radiotherapy after radical mastectomy for left breast cancer, and to provide a basis for individualized clinical target volume-planning target volume (CTV-PTV) expansion for the doctor in charge to delineate the target volume. Methods A total of 36 patients with left breast cancer after radical mastectomy were selected and divided into three groups, in which cone beam computed tomography (CBCT) images were taken in three states: DIBH, FB1, and FB2, respectively. CBCT and CT images were analyzed for registration; the absolute error data of linear displacement in the ventro-dorsal, cranio-caudal, and left-right directions were recorded, and the expanding margin was calculated. Results The translation errors in the ventro-dorsal, cranio-caudal, and left-right directions were (0.06 ± 0.22) cm, (0.05 ± 0.23) cm, and (0.01 ± 0.24) cm in the DIBH group, (0.07 ± 0.21) cm, (0.02 ± 0.23) cm, and (0.02 ± 0.21) cm in the FB1 group, and (0.07 ± 0.24) cm, (0.07 ± 0.34) cm, and (0.25 ± 0.09) cm in the FB2 group. The statistical results of the DIBH group and FB1 group in the ventro-dorsal, RTN, and ROLL directions were significantly different (P < 0.05). The statistical results of the FB1 group and FB2 group in the ventro-dorsal direction were significantly different. The relation of three groups in the value of margin of planning target volume was DIBH < FB1 < FB2 in the ventro-dorsal and cranio-caudal directions and FB1 < DIBH < FB2 in the left-right direction. Conclusion OSMS-guided DIBH radiotherapy in patients with left breast cancer after radical mastectomy can reduce the setup error and provide an important basis for individualized CTV-PTV expansion for the doctor in charge to delineate the target volume.
