Application and evaluation of OSMS guided DIBH radiotherapy for left-sided breast cancer(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第7期
- Page:
- 793-797
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application and evaluation of OSMS guided DIBH radiotherapy for left-sided breast cancer
- Author(s):
- ZHANG Guangwei; ZHONG Heli; WU Hegou; LIU Jianfeng; ZHANG Ding; YANG Dong; FAN Juan; LI Bin; XU Guangran
- 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: optical surface monitoring system radiotherapy left-sided breast cancer deep inspiration breath hold automatic positioning
- PACS:
- R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.07.001
- Abstract:
- Abstract: Objective To evaluate the clinical value of optical surface monitoring system (OSMS) guided deep inspiration breath hold (DIBH) radiotherapy for left-sided breast cancer by analyzing positioning accuracy, setup time and cardiac position. Methods Thirty patients with left-sided breast cancer after breast-conserving surgery were enrolled in the study. The Move Couch function of OSMS was used for automatic positioning, and DIBH radiotherapy was realized based on OSMS guided positioning, DIBH and treatment monitoring. After CBCT registration, the six-dimensional absolute errors of target areas and the errors of cardiac position were analyzed, and meanwhile the setup time which was defined as the time from the patients contact with the couch to the time before CBCT scanning or before accelerator beam on (without CBCT scanning) was recorded. Results The absolute setup errors were (0.11±0.08), (0.14±0.11), (0.13±0.10) cm in x, y, z directions, respectively, and (0.79±0.66)°, (0.69±0.57)°, (0.73±0.64)° in Rx, Ry, Rz directions, respectively. The averages of cardiac position deviations were (0.01±0.30), (0.05±0.34), (0.01±0.09) cm in x, y, z directions. The recorded setup time was (4.1±1.2) min. Conclusion DIBH technique for left-sided breast cancer makes the heart distant from treatment target area by moving the heart to posterior and inferior directions, thereby lowering the radiation dose delivered to the heart. OSMS guided DIBH radiotherapy for left-sided breast cancer results in a good positioning accuracy of target areas and the heart. The automatic positioning function of OSMS contributes to improving positioning accuracy and reducing setup time.
Last Update: 2021-07-26