Application value of thermoplastic film combined with styrofoam fixation technology in radiotherapy for cervical cancer(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2019年第6期
- Page:
- 636-640
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application value of thermoplastic film combined with styrofoam fixation technology in radiotherapy for cervical cancer
- Author(s):
- LIU Weiwei; WANG Meijiao; YANG Jingxian; YU Songmao; DU Yi
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing 100142, China
- Keywords:
- ; Keywords: cervical cancer; cone beam computed tomography; volumetric modulated arc therapy; thermoplastic film; styrofoam; setup error
- PACS:
- R739.63
- DOI:
- DOI:10.3969/j.issn.1005-202X.2019.06.004
- Abstract:
- Abstract: Objective To apply cone beam computed tomography (CBCT) for comparing the setup errors in cervical cancer radiotherapy using pelvic thermoplastic film combined with styrofoam fixation technology vs pelvic thermoplastic film fixation. Methods The data gathered from 62 CBCT of 13 cases of pelvic thermoplastic film combined with styrofoam fixation and 71 CBCT of 14 cases of pelvic thermoplastic film fixation were retrospectively analyzed. The setup errors and its distribution in 4 directions, namely left-right (Lat), front-back (Vrt), head-foot (Lng) and bed angle (Rtn), were analyzed. Results The setup errors in Lat, Vrt and Lng directions were within 5 mm and Rtn error was within 3°, which accorded with the requirements of clinical treatment. No statistical difference was found in the setup errors in Lat and Rtn directions between the two kinds of fixations (P>0.05). Compared with pelvic thermoplastic film fixation, pelvic thermoplastic film combined with styrofoam fixation achieved a better stability of Vrt and Lng directions (P=0.018, 0.002). When pelvic thermoplastic film combined with styrofoam fixation was adopted, there were 61 times (98.39%) of setup errors ≤3 mm in Lat direction, 59 times (95.16%) in Vrt direction and 58 times (93.55%) in Lng direction. When only pelvic thermoplastic film fixation was adopted, there were 63 times (88.73%) of setup errors ≤3 mm in Lat direction, 58 times (81.69%) in Vrt direction and 54 times (76.06%) in Lng direction. Conclusion Pelvic thermoplastic film combined with styrofoam fixation is superior to pelvic thermoplastic film fixation in the stability of Vrt and Lng directions.
Last Update: 2019-06-25