An investigation of precision of full six-degree target shift corrections using the ArcCHECK system
10.3760/cma.j.issn.1004-4221.2018.02.015
- VernacularTitle:基于ArcCHECK系统六维摆位误差校正方法精确性观察
- Author:
Penggang BAI
1
;
Yitao DAI
;
Rongqin CHEN
;
Qixin LI
;
Yanming CHENG
;
Chuanben CHEN
;
Zhaodong FEI
;
Kaiqiang CHEN
;
Jihong CHEN
Author Information
1. 福建省肿瘤医院暨福建医科大学附属肿瘤医院放疗科
- Keywords:
Nasopharyngeal neoplasm/intensity-modulated radiotherapy;
Full six-degree shift corrections;
Correction of error
- From:
Chinese Journal of Radiation Oncology
2018;27(2):195-198
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the precision of full six-degree target shift corrections using the ArcCHECK system.Metbods Fourteen patients receiving intensity-modulated radiotherapy (IMRT) for nasopharyngeal carcinoma (NPC) in Fujian Medical University Cancer Hospital from May to September,2015 were selected.The first treatment setup errors were obtained using cone-beam computed tomography.The setup errors were simulated in ArcCHECK,and the full six-degree target shift corrections was used to correct the errors.The plans without and with setup errors and the plan with corrected setup errors were taken.The paired t-test was used to compare dose to agreement (DTA) and Gamma passing rates between the plan without setup errors and the plan with setup errors and plan with corrected setup errors.Results The DTA and Gamma passing rates were (96.76± 1.57)％ and (98.35±0.92)％ for the plan without setup errors,(59± 21.42) ％ and (62.86± 21.63) ％ for the plan with setup errors,and (91.41± 4.82) ％ and (94.11±4.33)％ for the plan with corrected setup errors.There were significant differences between the plan without setup errors and the plan with setup errors and plan with corrected setup errors in DTA passing rate (t=6.64 and 5.13,both P＜0.05) and Gamma passing rate (t=6.15 and 4.19,both P＜0.05).Conclusions The full six-degree target shift corrections can be used in IMRT for NPC,with good results in correcting setup errors and improving the precision for IMRT dose distribution.
