医用直线加速器机载影像系统QC图像定量评估方法研究

doi:10.3760/cma.j.issn.1004-4221.2017.04.016

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Abstract Objective To establish a quantitative evaluation of quality control image for the on-board imaging system of medical linear accelerator. Methods An MV planar image of electronic portal imaging device (EPID) is acquired by both Elekta iViewGT and Varian aS1000, and a kV planar image and cone-beam computed tomography (CBCT) images of CBCT are acquired by both Elekta X-ray volume imaging (XVI) and Varian On-board Imager (OBI). Phantoms used here included Las Vegas, TOR18FG, and Catphan504. A series of image quality indicators were evaluated by analyzing the images mentioned above using a quantitative method. Results A quantitative value was calculated to represent the contrast resolution of EPID. A modulation transfer function (MTF) to describe spatial resolution and a quantitative value representing contrast resolution were calculated for the kV planar image. As for the CBCT system, a series of quantitative Results of noise, uniformity, CT value accuracy, and contrast resolution and a MTF were calculated to represent the performance of CBCT system. Conclusions Based on common phantoms, a complete set of quantitative Methods to evaluate the image quality of EPID and CBCT has been developed, which could provide a very good reference for the establishment of quality control system for image-guided radiotherapy.

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	Articles by authors
	Zhuang Yongdong
	Wang Bin
	Zhu Jinhan
	Liu Boji
	Liu Xiaowei
	Chen Lixin

Key words： Tomography,X-ray computed,cone beam Quantitative method Modulation transfer function Quality control

Received: 27 April 2016

Fund:Natural Science Foundation of Guangdong Province (2014A030310188);Natural Science Foundation of Guangdong Province (2016A030313276);Guangzhou Science and Technology Program (20160701168)

Corresponding Authors: Liu Xiao-wei,Email:stslxw@mail.sysu.edu.cn;Chen Lixin,Email:chenlx@sysucc.org.cn

Cite this article:

Zhuang Yongdong,Wang Bin,Zhu Jinhan et al. A quantitative evaluation of quality control image for on-board imaging system of medical linear accelerator[J]. Chinese Journal of Radiation Oncology, 2017, 26(4): 442-447.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2017.04.016 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2017/V26/I4/442

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