Comparison of reset errors in simulator for patients with tumors in different locations(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第2期
- Page:
- 141-144
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Comparison of reset errors in simulator for patients with tumors in different locations
- Author(s):
- YU Songmao; YANG Jingxian; KANG Jiafu; LIU Wei; YUE Haizhen
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiotherapy, Peking University Cancer Hospital & Institute, Beijing 100142, China
- Keywords:
- ; tumor; intensity-modulated radiotherapy; simulator; image registration; registration error; total registration error; rest error
- PACS:
- R730.5
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.02.004
- Abstract:
- Objective To compare and analyze the reset errors acquired by simulator during the verification of treatment plans for tumors in different locations. Methods A total of 104 cases of treatment plans which were verified on Acuity simulator (Varian Medical systems, Palo Alto, California) were selected, involving 28 cases of pelvic tumors, 32 of head and neck tumors, and 44 of thoracic tumors. All patients were positioned according to the location of the crosshair and the relative coordinates obtained from the treatment planning system. Based on the requirements of intensity-modulated radiotherapy, two orthogonal X-ray images (one in coronal plane, the other in sagittal plane) were acquired for each case. The registration error (RE) of the digitally reconstructed radiograph images generated by the planning system and the obtained orthogonal X-ray images was obtained by automatic built-in rigid registration algorithm. The RE and total RE in X (left-right), Y (superior-inferior) and Z (anterior-posterior) orientations were analyzed, thus quantitatively analyzing the distribution of reset errors. Results The mean±SD of the total RE was (0.31±0.14), (0.17±0.07), (0.26±0.10) cm for pelvic tumors, head and neck tumors, and thoracic tumors, which revealed that the positioning repeatability of head and neck tumors is superior to that of tumors in other locations. Conclusion The registration accuracy of tumors in different locations satisfies the clinical requirement, and the RE of head and neck tumors is the smallest, which indicated that the head and neck tumors had a small reset error and a good positioning repeatability.
Last Update: 2018-01-29