ArcCHECK系统在食管癌螺旋断层放疗计划验证中的应用

doi:10.3760/cma.j.cn113030-20181221-00005

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Abstract Objective To explore the application of ArcCheck system in the validation of Helical and Direct tomotherapy plans for esophageal cancer and summarize relevant experience. Methods The Helical and Direct tomotherapy verification plans were established for 32 patients with esophageal cancer at different positions according to the doctor′s instructions, which were verified by the ArcCHECK system to compare the passing rate of the results.The correlation between the volume of the target area and the passing rate of the planned verification was analyzed. The therapeutic verification plan with a small target volume was made. The target area was placed at the center of ArcCHECK phantom and the area of detectors to statistically compare the verification passing rates. Results Helical plan showed a significantly higher passing rate than the Direct plan (P<0.01). The correlation coefficients between the target volume and the passing rate of the Helical and Direct plans were -0.364 and -0.042, and the P values were 0.041 and 0.819, respectively. For the Helical plan, when the 3%/2mm criterion was adopted, there was significant difference between placing the high-dose area at the center of the phantom and the area of detectors (P=0.005), and the passing rate of the latter was higher. There was no significant difference in the other cases (all P>0.05). Conclusions The passing rate of the Helical plan is generally higher than that of the Direct plan, which may be related to the angular response of the ArcCHECK detector and the fact that more reference points are not included for calculation due to low-dose radiation. In addition, it may also be related to the higher requirements of Direct plan for tomotherapy dose control system. In the Helical verification plan, when the 3%/3mm criterion is adopted, the larger the target volume, the higher the possibility of lower passing rate, whereas the correlation coefficient between them is relatively low. The high-dose area can be verified by the plans at the center of the phantom or the detection point. With the comprehensive consideration, we suggest putting it at the center of the phantom.

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	Articles by authors
	Wang Zhenli
	Zheng Anping
	Zhu Jian
	Du Hongling
	Sun Xiaodong
	Wang Dong
	Wang Huitao
	Zhang Yaowen
	Zhu Qingshan
	Cui Zhenhua

Key words： Esophageal neoplasm/helical tomotherapy ArcCHECK system Plan verification Quality assurance

Received: 21 December 2018

Fund:National Natural Science Foundation of China (81671785,81530060); National Key Research and Develop Program of China (2016YFC0105106); Key Research and Development Program of Shandong Province (2017CXZC1206); Natural Science Foundation of Shandong Province (ZR2016HQ09); Medical Science and Technology Research Plan of Henan Province (2018021020); Young and Middle-Aged Scientific Research Project Special Funds of Anyang Tumor Hospital ([2019]23)

Corresponding Authors: Zheng Anping,Email:zhenganping3@126.com;Zhu Jian,Email:zhujian.cn@163.com

Cite this article:

Wang Zhenli,Zheng Anping,Zhu Jian et al. Application of ArcCHECK system in the verification of tomotherapy plan for esophageal cancer[J]. Chinese Journal of Radiation Oncology, 2020, 29(4): 273-277.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.cn113030-20181221-00005 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2020/V29/I4/273

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