EPID在VMAT技术验收测试中的应用研究

doi:10.3760/cma.j.issn.1004-4221.2017.02.016

Abstract
Figure/Table
References()
Related Citation (15)
Read Tracking
Download Tracking

Download: PDF (954 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS) Supporting Info

Abstract Objective To apply electronic portal imaging device (EPID) in the quality assurance of volumetric modulated arc therapy (VMAT) delivered by TrueBeam linear accelerator. Methods The Shaper software and Eclipse treatment planning system (TPS) were used to edit the VMAT plan delivered by TrueBeam linear accelerator. The EPID was used to evaluate the setup accuracy of multi-leaf collimator (MLC) and clinical dosimetry. TA:a field with a size of 0.5 cm×20.0 cm was exposed with gantry angles of 0°, 90°, and 270°, respectively;TB:the flatness and stability of the field were tested with different combinations of dose rate and gantry angle speed;TC:the setup accuracy of MLC was evaluated with or without rotation;TD:the accuracy of speed change control of MLC was evaluated with or without rotation;TE:the accuracy of simultaneous changes in dose rate and gantry angle speed was evaluated;TF:Clinical patients were evaluated. The Matlab software was used to analyze the results. Results TA:the full width at half maximum of superimposed fields exposed with gantry angles of 0°, 90°, and 270°was 0.39 mm larger than that of the field exposed with a gantry angle of 0°. TB:the difference in flatness was less than 0.5% between fields with different combinations of dose rate and gantry angle speed. TC:the maximum difference in field center was 0.45 mm between EPID measurement and TPS setting. TD:the maximum difference in MLC position was 0.69 mm between EPID measurement and TPS setting. TE:the maximum difference was 0.42 mm between fields. TF:for all the patients, the lowest γ passing rate was 96.4% according to the criterion of 3%/3 mm. Conclusions EPID is an accurate and convenient approach for VMAT quality assurance, which provides an option for physicists to reduce workload.

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Ma Yangguang
	Pei Yuntong
	Mai Rizhen
	Hu Jinyan
	Liu Shuaipeng
	Jia Fei
	Wang Tao
	Liu Lele
	Guo Yuexin

Key words： Electronic portal image device Volumetric modulated arc therapy Quality control
Fund program:Henan Medical Science and Technology Project (201303043)

Received: 26 April 2016

Corresponding Authors: Guo Yuexin,Email:guoyx0371@126.com

Cite this article:

Ma Yangguang,Pei Yuntong,Mai Rizhen et al. Commission of volumetric modulated arc therapy with electronic portal image device[J]. Chinese Journal of Radiation Oncology, 2017, 26(2): 197-201.

URL:

http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2017.02.016 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2017/V26/I2/197

[1] Ling CC,Zhang P,Archambaul T,et al. Commissioning and quality assurance of rapidArc radiotherapy delivery system[J].Int J Radiat Oncol Biol Phys,2008,72(2):575–581.DOI:10.1016/j.ijrobp.2008.05.060.
[2] Bedford JL,Warrington AP.Commissioning of volumetric modulated arc therapy (VMAT)[J].Int J Radiat Oncol Biol Phys,2009,73(2):537-545.DOI:10.1016/j.ijrobp.2008.08.055.
[3] Bhagwat MS,Han ZH,Ng SK,et al. An oscillating sweeping gap test for VMAT quality assurance[J].Phys Med Biol,2010,55(17):5029-5044.DOI:10.1088/0031-9155/55/17/010.
[4] 庄名赞,张拓丹,彭逊,等.应用电子射野影像装置进行RapidArc系统质量控制的初步探讨[J].中华放射肿瘤学杂志,2013,22(1):16-17.DOI:10.3760/cmaj.issn.1004-4221.2013.01.005.
Zhuang MZ,Zhang TD,Peng S,et al. A preliminary study on the quality control of RapidArc system using electronic portal imaging device[J].Chin J Radiat Oncol,2013,22(1):16-17.DOI:10.3760/cmaj.issn.1004-4221.2013.01.005.
[5] 杨瑞杰,张喜乐,谢耀钦,等.Axesse 加速器实施 VMAT 的主要性能测试[J].中华放射肿瘤学杂志,2016,25(3):260-265.DOI:10.3760/cma.j.issn.1004-4221.2016.03.014.
Yang RJ,Zhang XL,Xie YQ,et al. The main performance test of VMAT accelerator in the implementation of Axesse[J].Chin J Radiat Oncol,2016,25(3):260-265.DOI:10.3760/cma.j.issn.1004-4221.2016.03.014.
[6] Bedford JL,Hanson IM,Hansen VN.Portal dosimetry for VMAT using integrated images obtained during treatment[J].Med Phys,2014,41(2):021725.DOI:10.1118/1.4862515.
[7] McCowan PM,McCurdy BMC.Frame average optimization of cine-mode EPID images used for routine clinical in vivo patient dose verification of VMAT deliveries[J].Med Phys,2016,43(1):254-261.DOI:10.1118/1.4938413.
[8] 康德华,邓小武,黄邵敏.利用非晶硅电子射野影像系统对多叶准直器叶片到位精度作质量控制[J].癌症,2009,28(7):771-774.DOI:10.3321/j.issn.1000-467X.2009.07.019.
Kang DH,Deng XW,Huang SM.Using amorphous silicon electronic portal imaging system for multi leaf collimator leaf position accuracy of quality control[J].Cancer,2009,28(7):771-774. DOI:10.3321/j.issn.1000-467X.2009.07.019.
[9] 曹征,李红霞,鲍杨漪,等.应用EPID代替胶片法对MLC的质控研究[J].中华放射肿瘤学杂志,2015,24(5):573-577.DOI:10.3760/cma.j.issn.1004-4221.2015.05.025.
Cao Z,Li HX,Bao YY,et al. Research on quality control of MLC by using EPID instead of film method[J].Chin J Radit Oncol,2015,24(5):573-577.DOI:10.3760/cma.j.issn.1004-4221.2015.05.025.
[10] Zhu JH,Chen LX,Jin GH,et al. A comparison of VMAT dosimetric verifications between fixed and rotating gantry positions[J].Phys Med Biol,2013,58(5):1315-1322.DOI:10.1088/0031-9155/58/5/1315.
[11] 马攀,戴建荣,Jie S.二维半导体探测器阵列在多叶准直器日常质量保证中的应用[J].中华放射医学与防护杂志,2009,29(2):217-220.DOI:10.3760/cma.j.issn.0254-5098.2009.02.037.
Ma P,Dai JR,Jie S.Application of 2D diode array in multi leaf collimator in daily quality assurance[J].Chin J Radiol Med Protect,2009,29(2):217-220.DOI:10.3760/cma.j.issn.0254-5098.2009.02.037.