Trilogy直线加速器光子束和电子束吸收剂量的测量和标定
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摘要
目的对医院新引进的瓦里安Trilogy直线加速器按照国际原子能机构(IAEA)TRS277号报告进行光子束和电子束吸收剂量的测量和标定,将吸收剂量在参考条件下标定为1 MU=1 c Gy,确保输出剂量准确,以便后期的投入临床使用。方法采用德国PTW公司的UNDOS E型静电计和TW30013 0.6cc指形电离室和普通三维水箱现场测量Trilogy直线加速器光子束和电子束的吸收剂量,然后通过调节加速器上剂量监测系统的电位器,使得机器输出1 MU=1 c Gy。结果经过测量和标定后,测得光子束和电子束的吸收剂量结果误差<1%。结论经过对Trilogy直线加速器光子束和电子束吸收剂量的测量和标定后,其输出剂量符合国家要求。
Objective To measure and calibrate the photon beam and electron beam absorbed dose according to IAEA TRS277 report for the newly introduced Varian Trilogy linear accelerator in our hospital. The absorbed dose is set as 1 MU=1 c Gy in the reference condition to ensure accurate output dose for later clinical use. Methods The absorbed doses of the photon and electron beams of the Trilogy linear accelerator were measured in situ using the UNDOS E-type electrometer from PTW, Germany, and the TW30013 0.6 cc finger ionization chamber and the ordinary three-dimensional water tank. The potentiometers of the dose monitoring system on the accelerator were then adjusted. Makes the machine output 1 MU=1 c Gy. Results After measurement and calibration, the measured dose errors of the photon beam and electron beam were less than <1%. Conclusion After measuring and calibrating the absorbed dose of photon beam and electron beam of Trilogy linear accelerator, the output dose meets the national requirements.
Objective To measure and calibrate the photon beam and electron beam absorbed dose according to IAEA TRS277 report for the newly introduced Varian Trilogy linear accelerator in our hospital. The absorbed dose is set as 1 MU=1 c Gy in the reference condition to ensure accurate output dose for later clinical use. Methods The absorbed doses of the photon and electron beams of the Trilogy linear accelerator were measured in situ using the UNDOS E-type electrometer from PTW, Germany, and the TW30013 0.6 cc finger ionization chamber and the ordinary three-dimensional water tank. The potentiometers of the dose monitoring system on the accelerator were then adjusted. Makes the machine output 1 MU=1 c Gy. Results After measurement and calibration, the measured dose errors of the photon beam and electron beam were less than <1%. Conclusion After measuring and calibrating the absorbed dose of photon beam and electron beam of Trilogy linear accelerator, the output dose meets the national requirements.
引文
[1]胡逸民.肿瘤放射物理学[M].北京:原子能出版社,2003:178.
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[5]张绍刚,胡家成,杨小元,等.医用加速器输出剂量的测量与校准[J].现代测量与实验室管理,2003,11(5):9-12.
[6]余海坤,李杰才,朱锦贤,等.用新计量检定规程测定高能X(y)线和电子束的吸收剂量[J].广西医学,2004,26(3):51-52.
[7]姜秀英,陈海.高能X线和电子线吸收剂量的标定[J].中国医疗设备,2006,21(3):19-20.
[8]郭妍妍,毕平,李小东,等.高能电子束不同吸收剂量测量方法的比较研究[J].中华放射医学与防护杂志,2013,33(3):314-317.
[9]李智华.高能光子束和电子束吸收剂量测定的IAEA方法[J].中华放射肿瘤学杂志,2001,10(1):12-13.
[10]李军,张西志,谭飞.高能X线和电子束吸收剂量的测量与计算[J].中国医学物理学杂志,2008,25(2):564-566.
[2]Oguchi H.Change of absorbed dose determination in external beam radiotherapy(sequel)[J].Nihon Hoshasen Gijutsu Gakkai Zasshi,2012,68(7):906-910.
[3]Castro P,García-Vicente F,Mínguez C,et al.Study of the uncertainty in the determination of the absorbed dose to water during externalbeam radiotherapy calibration[J].J Appl Clin Med Phys,2008,9(1):2676.
[4]张绍刚.放射治疗中常规剂量的测算(之一)——吸收剂量的测量和加速器的刻度[J].医疗装备,2009,22(4):1-10.
[5]张绍刚,胡家成,杨小元,等.医用加速器输出剂量的测量与校准[J].现代测量与实验室管理,2003,11(5):9-12.
[6]余海坤,李杰才,朱锦贤,等.用新计量检定规程测定高能X(y)线和电子束的吸收剂量[J].广西医学,2004,26(3):51-52.
[7]姜秀英,陈海.高能X线和电子线吸收剂量的标定[J].中国医疗设备,2006,21(3):19-20.
[8]郭妍妍,毕平,李小东,等.高能电子束不同吸收剂量测量方法的比较研究[J].中华放射医学与防护杂志,2013,33(3):314-317.
[9]李智华.高能光子束和电子束吸收剂量测定的IAEA方法[J].中华放射肿瘤学杂志,2001,10(1):12-13.
[10]李军,张西志,谭飞.高能X线和电子束吸收剂量的测量与计算[J].中国医学物理学杂志,2008,25(2):564-566.