[1]时颖华,葛超,王利波,等. 均整与非均整模式下TrueBeam加速器治疗床对放疗剂量的影响[J].中国医学物理学杂志,2019,36(8):867-871.[doi:DOI:10.3969/j.issn.1005-202X.2019.08.001]
　SHI Yinghua,GE Chao,WANG Libo,et al. Effects of carbon fiber couch of TrueBeam accelerator in flattening filter-free and flattening filter modes on radiotherapy dose[J].Chinese Journal of Medical Physics,2019,36(8):867-871.[doi:DOI:10.3969/j.issn.1005-202X.2019.08.001]
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 均整与非均整模式下TrueBeam加速器治疗床对放疗剂量的影响()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
36卷
期数:
2019年第8期
页码:
867-871
栏目:
医学放射物理
出版日期:
2019-08-26

文章信息/Info

Title:
 Effects of carbon fiber couch of TrueBeam accelerator in flattening filter-free and flattening filter modes on radiotherapy dose
文章编号:
1005-202X（2019）08-0867-05
作者:
 时颖华; 葛超; 王利波; 夏文明; 陈坤志; 杨旭; 董丽华; 王辉东; 高岩
 吉林大学白求恩第一医院放疗科， 吉林 长春 130021
Author(s):
 SHI Yinghua;  GE Chao;  WANG Libo;  XIA Wenming;  CHEN Kunzhi;  YANG Xu;  DONG Lihua;  WANG Huidong;  GAO Yan
 Department of Radiotherapy, the First Bethune Hospital of Jilin University, Changchun 130021, China
关键词:
 ; 碳纤维床; 均整模式; 非均整模式; 穿透因子; 表面剂量
Keywords:
 ; Keywords: carbon fiber couch;  flattening filter mode;  flattening filter-free mode;  penetration factor;  surface dose
分类号:
R815.6；R312
DOI:
DOI:10.3969/j.issn.1005-202X.2019.08.001
文献标志码:
A
摘要:
 目的：探讨均整（FF）与非均整（FFF）模式下瓦里安TrueBeam加速器全碳纤维治疗床对模体中心和表面剂量的影响。方法：将30 cm×30 cm×20 cm的固体水模分别放置于治疗床薄、中、厚段上，模体的中心与加速器等中心重合，德国IBA FC65-G电离室测量等中心的剂量；选取6/10 MV光子束FF/FFF模式4档能量，10 cm×10 cm标准射野，等中心照射，以机架转角0°~80°（间隔10°采样）为参考，计算100°~180°范围与对应角度参考剂量的比值得到对应角度的穿透因子；将EBT3胶片分别置于上述模体表面和底部，对应机架角度为0°和180°，分析相应的百分深度剂量。结果：4档光子束能量下治疗床薄、中、厚段位置穿透因子范围分别为0.956 6~1.000 0、0.955 4~1.000 0和0.954 8~1.000 0，薄中段在6 MV-FFF 120°时最小，厚段在6 MV-FFF 130°时最小。与0°照射相比，180°照射6 MV-FFF、6 MV、10 MV-FFF和10 MV X射线表面剂量从30.6%、24.1%、18.3%和14.1%分别增加到95.4%、93%、83%和79.6%。结论：治疗床的存在减少肿瘤剂量、增加表面剂量，FFF模式较FF影响更大，在治疗计划系统中加入虚拟床减小了治疗床引起的剂量学影响。
Abstract:
 Abstract: Objective To evaluate the dosimetric effects of carbon fiber couch of Varian TrueBeam accelerator in flattening filter-free (FFF) and flattening filter (FF) modes on the central and surface doses of a phantom. Methods The solid water phantom of 30 cm×30 cm×20 cm was placed on 3 parts (thin, medium and thick) of treatment couch, and the center of the phantom was set at the isocenter of gantry. The isocenter dose was measured with German IBA FC65-G ionization chamber. In this study, 6/10 MV photon beam with FF/FFF models, a standard field of 10 cm×10 cm and isocentric irradiation were adopted. Taking the measured dose with beam incidence angle which was changed in every 10° gantry angles between 0° and 80° as reference, the penetration factor was obtained by calculating the ratio between the dose in the range of 100°-180° and the corresponding reference dose. EBT3 Gafchromic film was placed at the surface and bottom of the phantom, with a corresponding gantry angle of 0° and 180°. Finally, the corresponding percent depth doses were analyzed. Results The penetration factor were 0.956 6-1.0000, 0.955 4-1.000 0 and 0.954 8-1.000 0 at the thin, medium and thick parts of treatment couch. The penetration factor was minimal at 6 MV-FFF 120° for thin and thick parts of treatment couch, and at 6 MV-FFF 130° for the thick part of treatment couch. Compared with 0° irradiation, 180° irradiation with 6 MV-FFF, 6 MV, 10 MV-FFF and 10 MV X rays increased the surface doses from 30.6%, 24.1%, 18.3% and 14.1% to 95.4%, 93.0%, 83.0% and 79.6%, respectively. Conclusion The use of carbon fiber couch not only reduces tumor dose, but also increases surface dose. Moreover, the dosimetric effect of FFF modes is significantly larger than FF mode. The application of virtual carbon fiber couch in treatment planning system can reduce the dosimetric effects caused by treatment couch.

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备注/Memo

备注/Memo:
 【收稿日期】2018-12-04
【基金项目】国家重点研发计划（2017FYC0112104）；吉林省发改委课题（2016C053-1）；吉林省科技厅课题（201603040YY）
【作者简介】时颖华，物理师，研究方向：肿瘤放射物理，E-mail: shiyh1029@163.com
【通信作者】王辉东，物理师，研究方向：肿瘤放射物理，E-mail: wang_hd2010@163.com；高岩，工程师，研究方向：肿瘤精确放疗技术，E-mail: gao11020112@163.com
更新日期/Last Update: 2019-08-26