An investigation of precision of full six-degree target shift corrections using the ArcCHECK system
Bai Penggang, Dai Yitao, Chen Rongqin, Li Qixin, Cheng Yanming, Chen Chuanben, Fei Zhaodong, Chen Kaiqiang, Chen Jihong
Department of Radiation Oncolog (Bai PG, Dai YT, Li QX,Cheng YM,Chen CB,Fei ZD,Chen KQ, Chen JH),The Second Daytime Ward (Chen RQ) Fujian Cancer Hospital Fujian Medical University Cancer Hospital,Fuzhou 350014,China
Abstract：Objective To investigate the precision of full six-degree target shift corrections using the ArcCHECK system. Methods 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 betweenthe plan without setup errors and the plan with setup errors and plan with corrected setup errors. ResultsThe 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.
Bai Penggang,Dai Yitao,Chen Rongqin et al. An investigation of precision of full six-degree target shift corrections using the ArcCHECK system[J]. Chinese Journal of Radiation Oncology, 2018, 27(2): 195-198.
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2018, Vol. 27 
