Effects of automatic setup function of optical surface monitoring system on treatment accuracy and setup time of breast cancer patients undergoing radiotherapy(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第4期
- Page:
- 411-415
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Effects of automatic setup function of optical surface monitoring system on treatment accuracy and setup time of breast cancer patients undergoing radiotherapy
- Author(s):
- ZHANG Guangwei; WU Hegou; LIU Jianfeng; GAO Yan; LI Bin; ZHONG Heli
- Department of Radiation Oncology, Shenzhen Peoples Hospital/the Second Clinical Medical College of Jinan University/the First Affiliated Hospital of Southern University of Science and Technology, Shenzhen 518020, China
- Keywords:
- Keywords: breast cancer optical surface monitoring system radiotherapy automatic setup body surface marker
- PACS:
- R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.04.003
- Abstract:
- Abstract: Objective To investigate the effect of radiotherapy setup using the automatic setup function of optical surface monitoring system (OSMS) on the treatment precision and setup time of breast cancer patients undergoing radiotherapy, compared with the positioning using traditional body surface markers. Methods Thirty patients after radical mastectomy for breast cancer were enrolled in the study and randomly divided into two groups, with 15 patients in each group. In OSMS group, radiotherapy setup was guided by OSMS, and six-dimensional automatic couch shifting was used to move the patients to the correct position, while in the other group, radiotherapy setup was guided by body surface markers. Time for each setup and CBCT registration error data were recorded. The error data included the translational errors in left-right (x), head-foot (y), forward-backward (z) directions and the rotation errors in Rx, Ry and Rz directions. Independent sample t-test was conducted on CBCT registration error data and setup time data of two groups. Results The translational errors in x, y and z directions and the rotation errors in Rx, Ry and Rz directions in OSMS group were (0.12±0.11) cm, (0.12±0.09) cm, (0.13±0.08) cm, and 0.33°±0.43°, 0.56°±0.50°, 0.50°±0.52°, respectively, while those in body surface marker group were (0.15±0.11) cm, (0.22±0.16) cm, (0.25±0.16) cm, and 0.66°±0.72°, 0.99°±0.69°, 0.78°±0.56°, respectively. There were statistical differences between two groups in the translational errors in y and z directions and the rotation errors in Rx, Ry, Rz directions (P<0.01), and no statistical difference was found in the translational error in x direction. The absolute value of translational error ≤0.3 cm in x, y, and z directions accounted for 94%, 97%, 97% in OSMS group, and 91%, 63%, 60% in body surface marker group and the percentages of the absolute value of rotation error ≤1° in x, y, and z directions was 88%, 78%, 82% in OSMS group, and 74%, 53%, 67% in body surface marker group. Compared with setup guided by body surface markers, OSMS-guided automatic setup could reduce the setup time by about 70 s, with statistical differences ［(130±27) s vs (202±31) s, P<0.01］. Conclusion Compared with setup guided by body surface markers, the automatic setup function of OSMS can significantly improve setup accuracy and reduce setup time.
Last Update: 2021-04-29