[1]贾亚军,沈文同,闫渊林,等.基于IAEA 277和398报告在直线加速器FFF模式下绝对剂量校准结果对比[J].中国医学物理学杂志,2020,37(7):838-842.[doi:DOI:10.3969/j.issn.1005-202X.2020.07.008]
　JIA Yajun,SHEN Wentong,YAN Yuanlin,et al.Comparison of absolute dose calibration for linear accelerator in FFF mode based on IAEA 277 report versus IAEA 398 report[J].Chinese Journal of Medical Physics,2020,37(7):838-842.[doi:DOI:10.3969/j.issn.1005-202X.2020.07.008]
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基于IAEA 277和398报告在直线加速器FFF模式下绝对剂量校准结果对比()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
37
期数:
2020年第7期
页码:
838-842
栏目:
医学放射物理
出版日期:
2020-07-25

文章信息/Info

Title:
Comparison of absolute dose calibration for linear accelerator in FFF mode based on IAEA 277 report versus IAEA 398 report
文章编号:
1005-202X（2020）07-0838-05
作者:
贾亚军; 沈文同; 闫渊林; 陈佳艺; 贺晓东
上海交通大学医学院附属瑞金医院放疗科， 上海 200025
Author(s):
JIA Yajun;  SHEN Wentong;  YAN Yuanlin;  CHEN Jiayi;  HE Xiaodong
Department of Radiotherapy, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
关键词:
绝对剂量校准; IAEA 277号报告; IAEA 398号报告; FFF模式; 直线加速器
Keywords:
Keywords: absolute dose calibration IAEA 277 report IAEA 398 report flattening filter free mode linear accelerator
分类号:
R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2020.07.008
文献标志码:
A
摘要:
目的：基于IAEA 277和398号报告，分析对比直线加速器FFF模式下绝对剂量的校准结果。方法：利用上海交通大学医学院附属瑞金医院新安装的Varian Edge加速器，根据IAEA 398号报告，测量FFF模式下6X和10X光子线的射线质和百分深度剂量，计算电离室校准因子kQ、极化效应修正因子kpol、复合效应修正因子ks，并对比国内现阶段采用的IAEA 277号报告的校准值。结果：6X-FFF和10X-FFF下，射线质分别为0.629和0.708；校准深度均为10 cm，对应的kQ分别是0.997和0.988，kpol分别是1.000 9和1.001 2，ks分别是1.005 0和1.006 9。FFF模式下复合效应相比较FF模式略高，分别偏高0.36%和0.32%。IAEA 398号报告的校准结果与IAEA 277号报告相比，绝对剂量标准差异分别为-1.0%和-0.7%。结论：在FFF模式下，IAEA 398号报告的绝对剂量校准与现阶段国内采用的IAEA 277号报告相比，结果差异小于2%，且在临床实践中更便捷。
Abstract:
Abstract: Objective To compare the results of absolute dose calibration for linear accelerator in flattening filter free (FFF) mode based on International Atomic Energy Agency (IAEA) 277 report versus IAEA 398 report. Methods According to IAEA 398 report, the radiation quality and percentage depth dose of 6X-FFF and 10X-FFF beams were measured on the newly installed Varian Edge accelerator in Ruijin Hospital, Shanghai Jiaotong University School of Medicine. Ionization chamber correction factor kQ, polarity effect correction factor kpol and recombination correction factor ks were calculated and then the calibration results were compared with those obtained based on IAEA 277 report which is currently adopted in China. Results For 6X-FFF and 10X-FFF beams, the radiation quality was 0.629 and 0.708, respectively. The calibration depth for both 6X-FFF and 10X-FFF beams was 10 cm. The kQ, kpol, and ks for 6X-FFF beams were 0.997, 1.000 9, 1.005 0, respectively, while those for 10X-FFF beams were 0.988, 1.001 2 and 1.006 9, respectively. Compared with those in FF mode, the recombination effects for 6X-FFF and 10X-FFF beams in FFF modes were higher by 0.36% and 0.32%, respectively. The differences in the absolute dose calibration of 6X-FFF and 10X-FFF beams between IAEA 398 report and IAEA 277 report were -1.0% and 0.7%, respectively. Conclusion In FFF mode, the difference in the absolute dose calibration based on IAEA 398 report versus IAEA 277 report is less than 2%. Furthermore, the procedure in IAEA 398 report is more convenient in clinical practice.

备注/Memo

备注/Memo:
【收稿日期】2020-02-23 【收稿日期】上海市科技支撑项目（18441905600） 【作者简介】贾亚军，硕士，初级物理师，研究方向：医学物理，E-mail: jiayajunscu@163.com；沈文同，硕士，副主任技师，研究方向：医学物理，E-mail: js_cz_shenwu@sina.com（贾亚军与沈文同为共同第一作者） 【通信作者】贺晓东，博士，主任技师，研究方向：医学物理，E-mail: xiaodonghe888@sina.cn
更新日期/Last Update: 2020-07-28