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《Chongqing Medicine》 2017-26
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A clinical study of CBCT reduction before IMRT in nasopharyngeal carcinoma

Zhong Liangzhi;Li Guanghui;Dai Hongya;Zhou Yibing;Tumor Institute of PLA/Xinqiao Hospital,Third Military Medical University;  
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 3times were analyzed and summarized.Results In CBCT reduction,the absolute value at any direction≤3mm accounted for 89.9%(62/69),5mm 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 ≤3mm accounted for 92.8%(128/138),5mm 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(P0.05).Conclusion In formulating the nasopharyngeal carcinoma IMRT plan with the location center coordinates origin as the planned central point,adopting the CBCT reduction is intuitional,convenient,practicable and feasible.
【CateGory Index】: R739.63
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