Effects of a new carbon fiber couch of linear accelerator on radiotherapy dose(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第1期
- Page:
- 14-18
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Effects of a new carbon fiber couch of linear accelerator on radiotherapy dose
- Author(s):
- CAO Tingting1; QUAN Hong1; LIU Hui2; ZHANG Jun2; JIANG Dazhen2; SU Huanfan1
- 1. School of Physics and Technology, Wuhan University, Wuhan 430072, China; 2. Department of Radiation Oncology, Zhongnan Hospital, Wuhan University, Wuhan 430071, China
- Keywords:
- ; Keywords: linear accelerator; carbon fiber; treatment couch; attenuation factor; radiotherapy dose
- PACS:
- R815.6; TH774
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.01.004
- Abstract:
- Abstract: Objective To investigate the effects of a new carbon fiber couch of linear accelerator from Shanghai United Imaging Healthcare Co., Ltd on the radiotherapy dose. Methods The solid water phantom were placed in the middle (offset=0 cm), the right (offset=+10 cm) and the left (offset=-10 cm) of the treatment couch. The angle of gantry was changed to make the high-energy X-ray penetrate the treatment couch from different angles, and the corresponding attenuation factors of X-ray were calculated. Results The attenuation factors for 6 MV X-ray were 0.043 8-0.085 0 at the middle of the treatment couch, with a maximum attenuation factor at 115°; 0.044 1-0.127 2 at the right side of the treatment couch, with a maximum attenuation factor at 110°; 0.043 2-0.093 1 at the left side of the treatment couch, with a maximum attenuation factor at 110°. When the gantry angle was 180°-130°, the differences among the attenuation factors at the middle, the right and the left of the treatment couch were trivial, but the attenuation factor was higher at the right than at the middle and the left. Conclusion The attenuation of the new carbon fiber treatment couch of linear accelerator from Shanghai United Imaging Healthcare Co., Ltd varies at different positions with different angles of gantry. When the gantry angle was 130°-110°, the dose attenuation is higher at the right side of the treatment couch that at the middle and the left, and the maximum is at 110°. Those angles causing larger dose attenuations should be avoided in oblique field plan.
Last Update: 2018-01-25