摘要
通过对MatriXX和EPID两款探测器矩阵物理性能进行测试研究,为用于临床肺癌旋转机架角二维剂量验证提供参考。通过加速器出束,分别对MatriXX和EPID的绝对剂量重复性、剂量率响应性能、角度响应、剂量线性进行测试,选取20例肺癌放射治疗计划采用MatriXX和EPID进行旋转机架角二维平面剂量验证,并分析结果。两款测量设备绝对剂量重复性、剂量率响应性能、剂量线性性能较好,测试结果偏差较小,MatriXX角度响应性能较差,在2%/2 mm、3%/3 mm评判标准下,90°和270°γ通过率相对于0°时测量结果偏差近10%。对20例肺癌放疗计划剂量验证结果,在相同评判条件下,MatriXX比EPID计划验证γ通过率低10%左右。EPID半导体探测器矩阵能较好满足临床肺癌旋转计划剂量验证。MatriXX由于电离室自身角度响应的物理特性,从测试结果来看不推荐其应用于临床肺癌旋转计划剂量验证工作中。
This article conducts testing and research on the physical performance of MatriXX and EPID detector matrices,providing reference for two-dimensional dose verification of rotating rack angle in clinical lung cancer.The absolute dose repeatability,dose rate response performance,angle response,and dose linearity of MatriXX and EPID were tested using an accelerator beam output.Twenty lung cancer radiotherapy plans were selected to use MatriXX and EPID for two-dimensional dose validation of rotating gantry angles,and the results were analyzed.The absolute dose repeatability,dose rate response performance,and the dose linearity performance is good,the deviation of the test results is small,and the angle response performance of MatriXX is poor.Under the 2%/2 mm and 3%/3 mm evaluation standards,90°and 270°γThe deviation of the passing rate compared to the measurement results at 0°is nearly 10%.Under the same evaluation conditions,the results of dose validation for 20 lung cancer radiotherapy plans were compared with the EPID planγ.The pass rate is about 10%lower.EPID semiconductor detector matrix can better meet the verification of clinical lung cancer rotary planned dose.Due to the physical characteristics of the angle response of the ionization chamber,MatriXX is not recommended for clinical lung cancer rotation plan dose verification in this article based on the test results.
作者
叶芝甫
屈国普
蔡凯
彭旭
饶可
梁宗锦
覃正
韦贵锦
YE Zhifu;QU Guopu;CAI Kai;PENG Xu;RAO Ke;LIANG Zongjin;QIN Zheng;WEI Guijin(The First Affiliated Hospital of Guangxi University of Traditional Chinese Medicine,Nanning 530022,China;School of Nuclear Science and Technology,University of South China,Hengyang 421001,China)
出处
《核电子学与探测技术》
CAS
北大核心
2023年第6期1229-1235,共7页
Nuclear Electronics & Detection Technology
基金
国家自然科学基金项目(82260958)
广西壮族自治区卫生健康委员会自筹经费科研课题(ZA20220892)。
关键词
计划验证
探测器矩阵
肺癌
放射治疗
γ通过率
plan validation
detector matrix
lung cancer
radiation therapy
pass rate
作者简介
叶芝甫(1991-),男,四川西昌人,工程师,在读博士研究生,研究方向为核技术及应用研究,E-mail:841981376@qq.com。;通讯作者:屈国普,男,教授,E-mail:13973406083@163.com。
