A clinical study of CBCT reduction before IMRT in nasopharyngeal carcinoma
10.3969/j.issn.1671-8348.2017.26.021
- VernacularTitle:鼻咽癌IMRT治疗前采用CBCT复位的临床研究
- Author:
Liangzhi ZHONG
1
;
Guanghui LI
;
Hongya DAI
;
Yibing ZHOU
Author Information
1. 全军肿瘤诊治研究所/第三军医大学新桥医院肿瘤科
- Keywords:
nasopharyngeal neoplasms;
tomography,X-ray computed;
cone beam CT;
intensity modulated radiation therapy;
on board imager
- From:
Chongqing Medicine
2017;46(26):3661-3662,3665
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the feasibility of reduction by using cone beam computed tomography (CBCT) before intensity modulated radiation therapy(IMRT) in the patients with nasopharyngeal carcinoma.Methods Twenty-three patients with nasopharyngeal carcinoma (NPC) undergoing IMRT were included in this study.The reverse IMRT plan with CBCT verification was prepared with location center coordinates origin as the planned central point.Before therapy,the CBCT reduction was adopted,the CBCT scanning was performed before the second and third radiotherapies.The registering data in 3 times were analyzed and summarized.Results In CBCT reduction,the absolute value at any direction≤3 mm accounted for 89.9％ (62/69),＜5 mm accounted for 98.6 ％ (68/69),and the deviation value at every direction was (0.6 ± 2.1)mm;in the second and third CBCT,the absolute value at any direction ≤3 mm accounted for 92.8％ (128 q38),＜5 mm accounted for 99.3％ (137/138),and the deviation value at every direction was (0.4 ± 2.0) mm:the difference between the two sets of data had no statistically significant difference (P＞ 0.05).Conclusion In formulating the nasopharyngeal carcinoma IMRT plan withthe location center coordinates origin as the planned central point,adopting the CBCT reduction is intuitional,convenient,practicable and feasible.
