Application of OSMS in positioning for abdominal tumor radiotherapy(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第7期
- Page:
- 828-833
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application of OSMS in positioning for abdominal tumor radiotherapy
- Author(s):
- YE Feng; ZHAI Zhenyu; MU Zhongde
- Department of Radiotherapy, Jiangsu Cancer Hospital, Nanjing 210009, China
- Keywords:
- Keywords: abdominal tumor optical surface monitoring system positioning error
- PACS:
- R815
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.07.006
- Abstract:
- Abstract: Objective To investigate the role of optical surface monitoring system (OSMS) in the positioning for abdominal tumor radiotherapy by comparing with CBCT-based positioning, and to explore the positioning accuracy of OSMS and its application value. Methods Four patients with abdominal tumor were enrolled. The "+" mark on the body surface and laser lamp were used to realize pre-treatment positioning. During CBCT examination, OSMS was verified before operation. The registration information provided by OSMS and CBCT was recorded separately, and translational errors in X (left-right), Y (head-foot) and Z (front-back) directions were recorded. Pearson method was used for analyzing positioning errors, systematic errors and random errors, and Bland-Altman method for evaluating the confidence interval of OSMS. The k value of 95% dose-shifted target volume after positioning by the conventional method or OSMS was calculated. Results There was a good correlation between the positioning accuracy of CBCT and that of OSMS, and the correlation coefficients were 0.628, 0.858 and 0.682 in X, Y and Z directions, respectively. The systemic error ± random error of OSMS positioning were (0.01±0.33), (-0.14±0.64) and (0.13±0.41) mm in X, Y and Z directions, respectively, and the k value was (0.801 9±0.704 4)%. Conclusion OSMS in the actual application has a high consistency with CBCT registration data. OSMS which has a high accuracy in positioning can be used independently without the guidance of CBCT.
Last Update: 2020-07-28