Application of CT image-guided technology in radiotherapy of the mid-and upper-thoracic esophageal carcinoma
10.3760/cma.j.issn.0254-5098.2013.06.013
- VernacularTitle:滑轨CT图像引导技术在胸中上段食管癌放疗中的应用研究
- Author:
Dingjie LI
;
Hui WU
;
Ronghu MAO
;
Chengliang YANG
;
Hongchang LEI
;
Jianhua WANG
- Publication Type:Journal Article
- Keywords:
Esophageal carcinoma radiotherapy;
CT-based image guidance;
Set-up error;
Organ motion;
Clinical target volume margins
- From:
Chinese Journal of Radiological Medicine and Protection
2013;33(6):623-625
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the clinical target volume (CTV) expanding margins in the mid-and upper-thoracic esophageal carcinoma during radiotherapy measured with and without online image guidance technique by CT on rail.Methods 100 patients with mid-and upper-thoracic esophageal carcinoma undergoing intensity modulated radiotherapy received CT scanning.Image registration was conducted between the scanning results and the planned CT images,thus set-up error data were acquired and got on-line correction.Fifty patients were randomly selected to undergo additional post-treatment CT scanningso as to analyze the revised residuals,displacement during treatment,and infra-fraction GTV shifts.Results Compared to the radiotherapy without CT-based image guidance,the CTV expanding margins obtained with CT-based image guidance was reduced significantly from 9.1,8.8 and 6.1 mm to 4.1,4.5 and 4.3 mm in the left-right,head-feet,and belly-back directions respectively.Conclusions The on-line image-guided technology significantly improves the accuracy of target and reduces the CTV expanding margins.
