利用ArcCHECK在实际机架角与零机架角的IMRT剂量验证结果比较

doi:10.3760/cma.j.issn.1004-4221.2017.01.015

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Abstract

Objective To compare the γ passing rate between measurements at actual degree gantry angle and zero degree gantry angle for dose verification of intensity-modulated radiotherapy (IMRT) in the treatment of nasopharyngeal carcinoma (NPC) and cervical carcinoma. Methods Thirty patients with NPC and thirty patients with cervical carcinoma were randomly chosen from 87 patients with NPC and 54 patients with cervical carcinoma, respectively. Using a gamma criterion of 3 mm/3%, the γ passing rates at actual gantry angle and zero degree gantry angle were measured using ArcCHECK and compared by paired t test. Results The γ passing rate was significantly lower at actual gantry angle than at zero degree gantry angle in patients with NPC or cervical carcinoma ((93.8±3.6)% vs. (97.8±1.1)%, P=0.00;(96.3±2.1)% vs. (98.2±1.0)%, P=0.00). Moreover, the variation range of the γ passing rate at actual gantry angle was larger than that at zero degree gantry angle. Both γ passing rates at actual gantryangle and zero degree gantryangle were lower in the patients with NPC than in the patients with cervical carcinoma. Conclusions
Compared with that at zero degree gantry angle, the γ passing rate at actual gantry angle is closer to reality. Therefore, the actual gantry angle is recommended for dose verification. In order to meet the clinical requirement, a higher standard of γ passing rate should be proposed when zero degree gantry angle is used for dose verification.

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	Articles by authors
	Jiang Renwei
	Guo Shuanshuan
	Chen Shuting
	Wang Siyang
	Chen Zhibin

Key words： ArcCHECK Intensity modulated radiotherapy Dose verification

Received: 11 September 2015

Corresponding Authors: Wang Siyang,Email:13570608929@163.com

Cite this article:

Jiang Renwei,Guo Shuanshuan,Chen Shuting et al. A comparative study of ArcCHECK measurements at actual and zero degree gantry angles for dose verification of intensity-modulated radiotherapy[J]. Chinese Journal of Radiation Oncology, 2017, 26(1): 66-68.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2017.01.015 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2017/V26/I1/66

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