中国医疗设备2017，Vol.32Issue(10)：48-51,4.DOI:10.3969/j.issn.1674-1633.2017.10.012
绝对剂量的偏移对MatriXX剂量验证结果的影响
Influence of Deviation in Absolute Dose on Verification Results of MatriXX
摘要
Abstract
Objective To discuss the influence of deviation in absolute dose on verification results of IMRT fields of MatriXX. Methods Fields with gantry angle 180° (G180) were selected for 24 patients with cervical cancer, and corresponding verification plans were created. The verification plans were implemented in the Varian Clinac iX linear accelerator, and the dose distributions were measured by the two-dimensional ionization chamber array (MatriXX). OmniPro I'mRT software was used to simulate the deviation in absolute dose (d), and d ranged from -10％ to 10％ with interval of 1％. Corresponding dose verification results with different values of d were analyzed. Results By and large, gamma passing rate was decreased and value of average gamma was increased when absolute dose deviated to positive or negative directions. The maximum gamma passing rate was not in the position with d=0, but in the range of -3％ to -1％, and the values of d were in the range of -3％ to 0 when average gamma achieved the minimum value. Conclusion Deviation in absolute dose has a significant influence on verification results of IMRT fields of MatriXX. When analysing verification results, the factor of deviation in absolute dose should be taken into consideration. In routine work of radiotherapy, the absolute dose of Clinac accelerator should be calibrated regularly.关键词
Gamma通过率/绝对剂量/剂量验证/宫颈癌/调强放疗Key words
Gamma passing rate/absolute dose/dose verification/cervical cancer/intensity modulated radiation therapy分类
医药卫生引用本文复制引用
柏正璐,时飞跃,秦伟,蒋红兵..绝对剂量的偏移对MatriXX剂量验证结果的影响[J].中国医疗设备,2017,32(10):48-51,4.基金项目
南京市医学科技发展资金"青年工程"人才培养专项经费资助(QRX11033). （QRX11033）
