不同探测器测量射波刀输出因子比较分析

doi:10.3760/cma.j.issn.1004-4221.2017.11.017

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Abstract

Objective To compare five different detectors in output factor (OF) measurement for the CyberKnife (CK) system,and to select a suitable detector. Methods OFs for 12 different sizes of CK collimators were measured by EBT3 films and 5 different commercially available detectors,consisting of diode detectors PTW 60017 and PTW 60018,ionizing chamber detectors PTW 31010 and PTW 30013,and diamond detector PTW 600019.OF was compared between different detectors and different measurement orientations. Resutls When the size of collimator was larger than 30 mm,the OF deviation among five detectors was less than 1%.When the size of collimator was smaller than 30 mm,however,the OF deviation among five detectors became large and obviously increased with the decrease in the size of collimator. With a OF deviation less than 2%,PTW 60019 achieved the best agreement with films. Compared with films,diode detectors gave slightly higher OFs,while ionizing chamber detectors gave much smaller OFs. The OF measurement was also affected by measurement orientation. PTW 60019 gave a smaller OF in the direction parallel to the central axis than in the direction perpendicular to the central axis of the radiation field,while PTW 31010 had an opposite result. Conclutions When the size of collimator is larger than 30 mm,PTW 31010,PTW 60017,PTW 60018,and PTW 60019 can be directly used for the OF measurement. When the size of collimator is smaller than 30 mm,correction is needed for the OF measurement using the above detectors. PTW 30013 is not suitable for the OF measurement in the small radiation field.

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	Articles by authors
	Li Jun
	Yang Ruijie
	Zhang Xile
	Liu Lu
	Pan Yuxi
	Wang Junjie

Key words： Small field Output factor Detector Cyberknife

Received: 06 March 2017

Corresponding Authors: Yang Ruijie,Email:ruijyang@yahoo.com

Cite this article:

Li Jun,Yang Ruijie,Zhang Xile et al. Comparison of different detectors in output factor measurement for the CyberKnife system[J]. Chinese Journal of Radiation Oncology, 2017, 26(11): 1322-1326.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.issn.1004-4221.2017.11.017 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2017/V26/I11/1322

[1] 张红志,胡逸民,张春利,等.X线立体定向治疗系统的剂量测量小野剂量分布测量方法[J].中华放射肿瘤学杂志,1996,5(2):102-106.
Zhang HZ,Hu YM,Zhang CL,et al. Stereotactic radiotherapy dose measurement system Onokazu dose distribution measurement method[J].Chin J Radiat Oncol,1996,5(2):102-106.
[2] Westermark M,Arndt J,Nilsson B,et al. Comparative dosimetry in narrow high energy photon beams[J].Phys Med Biol,2000,45(3):685-702.
[3] Alfonso R,Andreo P,Capote R et al. A new formalism for reference dosimetry of small and nonstandard fields[J].Med Phys,2008,35(11):5179-5186.DOI:10.1118/1.3005481.
[4] Sorriaux J,Kacperek A,Rossomme S,et al. Evaluation of GafchromicEBT₃ films characteristics in therapy photon,electron and proton beams[J].Phys Med,2013,9(6):599-606.DOI:10.1016/j.ejmp.2012.10.001.
[5] Aland T,Kairn T,Kenny J,et al. Evaluation of a Gafchromic film dosimetry system for radiotherapy quality assurance[J]. Australas Phys Eng Sci Med,2011,34(2):251-260.DOI:10.1007/s13246-011-0072-6.
[6] Pappas E,Maris T G,Zacharopoulou F,et al. Small SRS photon field profile dosimetry performed using a PinPoint air ion chamber,a diamond detector,a novel silicondiode array (DOSI)[J].Med Phys, 2008,35(10):4640-4648.DOI:10.1118/1.2977829.
[7] Tyler M,Liu PZ,Chan KW,et al. Characterization of small field stereotactic radiosurgery beams with modern detectors[J].Phys Med Biol,2013,58(21):7595-7608.DOI:10.1088/0031-9155/58/21/7595.
[8] Bassinet C,Huet C,Derreumaux S,et al. Small fields output factors measurements and correction factors determination for several detectors for a Cyberknife and linear accelerators equipped with microMLC and circular cones[J].Med Phys,2013,40(7):1-13.DOI:10.1118/1.4823794.
[9] Scott A J D,Kumar S,Nahum A E,et al. Characterizing the influence of detector density on dosimeter response in non-equilibrium small photon fields[J].Phys Med Biol,2012,57(14):4461-4476.DOI:10.1088/0031-9155/57/14/4461.
[10] Dieterich S,Sherouse G W. Experimental comparison of seven commercial dosimetry diodes for measurement of stereotactic radiosurgery cone factors[J].Med Phys,2011,38(7):4166-4173.DOI:10.1118/1.3592647.
[11] Scott AJD,Nahum AE,Fenwick JD. Using a Monte Carlo model to predict dosimetric properties of small radiotherapy photon fields[J].Med Phys,2008,35(10):4671-4684.DOI:10.1118/1.2975223.
[12] Lárraga-Gutiérrez JM,Ballesteros-Zebadúa P,Rodríguez-Ponce M,et al. Properties of a commercial PTW-60019 synthetic diamond detector for the dosimetry of small radiotherapy beams[J].Phys Med Biol,2015,60(2):905-924.DOI:10.1088/0031-9155/60/2/905.
[13] 李勤,李光俊,韩军.加速器小射野剂量学特性的临床研究[J].中国辐射卫生,2007,16(4):444-445.
Li Q,Li GJ,Han J. Clinical study on dosimetric characteristics of small field of accelerator[J].Chin J Radiol Heal,2007,16(4):444-445.
[14] Moignier C,Huet C,Makovicka L,et al. Determination of the KQ (clinf clin,Qmsr fmsr) correction factorsfor detectors used with an 800 MU/min CyberKnifesystem equipped with fixed collimators and a study of detector response to small photon beams using a Monte Carlo method[J].Med Phys,2014,41(7):1-34.DOI:10.1118/1.4881098.
[15] Underwood TS,Winter HC,Hill MA,et al. Mass-density compensation can improve the performance of a range of of different detectors under non-equilibrium conditions[J].Phys Med Biol,2013,58(23):8295-8310.DOI:10.1088/0031-9155/58/23/8295.
[16] Russo S,Masi L,Francescon P,et al. Multicenter evaluation of a synthetic single crystal diamond detector for CyberKnife small fieldsizeoutput factors[J].Phys Med,2016,2(4):575-581.DOI:10.1016/j.ejmp.2016.03.005.
[17] Francescon P,Kilby W,Satariano N. Monte Carlo simulated correction factors for output factor measurement with the CyberKnife system results for new detectors and correction factor dependence on measurement distance and detector orientation[J].Phys Med Biol,2014,59(6):11-17.DOI:10.1088/0031-9155/59/6/N11.