Feasibility on optimizing MVCT scan range in tomotherapy of nasopharyngeal carcinoma(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第8期
- Page:
- 874-878
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Feasibility on optimizing MVCT scan range in tomotherapy of nasopharyngeal carcinoma
- Author(s):
- YANG Haisong1; NIE Xiaoli2; LIU Libin1; FU Wankai1; HUANG Xingwu1; ZOU Qinfeng1; BAI Penggang1
- 1. Department of Radiotherapy, Fujian Provincial Cancer Hospital/Fujian Medical University Cancer Hospital, Fuzhou 350014, China; 2. Department of Radiological Diagnosis, Fujian Provincial Cancer Hospital/Fujian Medical University Cancer Hospital, Fuzhou 350014, China
- Keywords:
- ; nasopharyngeal carcinoma; tomotherapy; MV-computed tomography; scan range; set-up errors
- PACS:
- R739.62
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.08.002
- Abstract:
- Abstract: Objective To explore the application of two scan ranges of MV-computed tomography (MVCT) in tomotherapy of nasopharyngeal carcinoma (NPC). Methods Twenty patients receiving tomotherapy for NPC were selected. Each patient was scanned by MVCT for 30 times, including 15 times of nasopharyngeal target area + neck and 15 of only nasopharyngeal target area. A total of 600 groups of data were obtained, and paired t test was conducted on the two groups. Results For the scan range of nasopharyngeal target area+neck, the linear errors in left-right (X), head-foot (Y) and front-back (Z) directions were (-0.20±1.15), (-0.01±1.60) and (0.02±0.83) mm, respectively, and the rotational errors that revolved around the 3 axes (U, V, W) were (-0.31±0.80)°, (0.27±0.80)° and (-0.06±0.58)°, respectively. For the scan range of only nasopharyngeal target area, the linear errors in X, Y and Z directions were (-0.21±1.39), (-0.13±1.85) and (-0.02±1.14) mm, respectively, and the corresponding rotational errors were (-0.05±0.89)°, (0.18±0.89)°and (-0.18±0.63)°, respectively. The comparison of differences in set-up errors between the two groups showed that P values in 6 directions (X, Y, Z, U, V and W) were 0.92, 0.19, 0.59, 0.00, 0.18 and 0.02, respectively. The statistical differences were found in U and W directions (P<0.05), but not in the other directions (P>0.05). Conclusion The two MVCT scan ranges in tomotherapy of NPC don’t show any statistical significance in linear errors. Therefore, the scan ranges of only nasopharyngeal target area can be applied for image-guided radiotherapy to shorten treatment time and reduce unnecessary radiation.
Last Update: 2018-07-26