[1]吴丽丽,张基永,黄宝添,等. 非均整模式光子线在乳腺癌调强放疗的剂量学评估[J].中国医学物理学杂志,2017,34(11):1086-1090.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.002]
 WU Lili,ZHANG Jiyong,HUANG Baotian,et al. Evaluation of intensity-modulated radiotherapy using flattening filter free photon beams for patients with breast cancer[J].Chinese Journal of Medical Physics,2017,34(11):1086-1090.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.002]
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 非均整模式光子线在乳腺癌调强放疗的剂量学评估()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
34卷
期数:
2017年第11期
页码:
1086-1090
栏目:
医学放射物理
出版日期:
2017-11-20

文章信息/Info

Title:
 Evaluation of intensity-modulated radiotherapy using flattening filter free photon beams for patients with breast cancer
文章编号:
1005-202X(2017)11-1086-05
作者:
 吴丽丽张基永黄宝添陆佳扬林珠张武哲
 汕头大学医学院附属肿瘤医院放疗科, 广东 汕头 515041
Author(s):
 WU Lili ZHANG Jiyong HUANG Baotian LU Jiayang LIN Zhu ZHANG Wuzhe
 Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou 515041, China
关键词:
 乳腺癌高剂量率照射非均整模式同步推量调强放射治疗
Keywords:
 breast cancer high dose rate irradiation flattening filter free mode simultaneous integrated boost intensity-modulated radiotherapy
分类号:
R730.55;R815
DOI:
DOI:10.3969/j.issn.1005-202X.2017.11.002
文献标志码:
A
摘要:
 目的:评估6 MV光子线高剂量率非均整模式(FFF)在右侧乳腺癌保乳术后大分割同步推量调强放疗(SIB-IMRT)的可行性。 方法:随机选取10例右侧乳腺癌保乳术后患者临床资料,分别给予瘤床靶区(PTV1)和全乳靶区(PTV2)处方剂量48 Gy和40 Gy,分15次照射。对每例患者分别制作FFF和均整模式(FF)两组SIB-IMRT计划,比较两组计划的靶区覆盖率、适形指数(CI)和均匀指数(HI)以及危及器官受量和计划执行效率。 结果:两种计划靶区的覆盖率、HI和CI的差异幅度小于1%。FFF计划PTV1的D98%高于FF计划(t=-2.297, P<0.05);PTV2的D90%低于FF计划(t=2.479, P=0.019);PTV2的CI稍劣于FF计划(t=5.343, P<0.001)。FFF计划患侧肺的V4 Gy和V16 Gy,健侧乳腺的Dmean和D5%,以及正常组织的Dmean、V5 Gy、V10 Gy和V20 Gy均低于FF计划(t=2.318~11.535, P<0.05);正常组织的V40 Gy(t=-2.967, P=0.016)和皮肤Dmean(t=-6.102, P<0.001)高于FF计划。FFF计划的MU值(1 417±230)高于FF计划MU值(1 106±208)(t=-8.220, P<0.001);照射时间比FF计划减少33%(t=11.788, P<0.001)。 结论:两种模式均能满足临床要求,FFF模式高剂量率光子线更有利于保护危及器官,显著缩短照射时间,执行效率较高。
Abstract:
 Abstract: Objective To evaluate the feasibility of 6 MV photon beam with flattening filter free (FFF) applied on hypofractionated simultaneous integrated boost intensity-modulated radiotherapy (SIB-IMRT) for patients receiving breast-conserving surgery for right-sided breast cancer. Methods The planning target volumes of tumor bed and breast (PTV1 and PTV2) of selected 10 patients treated with breast-conserving surgery for right-sided breast cancer were irradiated with 48 and 40 Gy in 15 fractions, respectively. For each case, SIB-IMRT plans with standard flattening filter (FF) mode and FFF mode were generated, respectively. The PTV coverage, conformity index (CI), homogeneity index, dose to organs-at-risk, monitor unit and delivery time were compared between FFF plan and FF plan. Results The differences between 2 plans in PTV coverage, homogeneity index and CI were within 1%. Compared with FF plan, FFF plan provided slightly higher D98% for PTV1 (t=-2.297, P<0.05), lower D90% and inferior CI for PTV2 (t=2.479, P=0.019; t=5.343, P<0.001). FFF plans also provided better sparing for V4 Gy and V16 Gy of ipsilateral lung, Dmean and D5% of contralateral breast, and lower mean dose, V5 Gy, V10 Gy and V20 Gy for normal tissue (t=2.318-11.535, P<0.05) as comparison with FF plan, while V40 Gy of normal tissue (t=-2.967, P=0.016) and skin mean dose (t=-6.102, P<0.001) were higher in FFF plan than in FF plan. Moreover, the monitor unit of FFF plans was significantly higher than that of FF plans [(1 417±230) vs (1 106±208); t=-8.220, P<0.001) ]. However, the delivery times of FFF plan were 33% less than that of FF plans (t=11.788, P<0.001). Conclusion Both FF plan and FFF plan meets the clinical requirements, but FFF plan is associated with a better organs-at-risk sparing, remarkably shorter treatment time and higher treatment efficiency.

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备注/Memo

备注/Memo:
 【收稿日期】2017-08-22
【基金项目】国家自然科学基金青年基金(81602667);广东省医学科学技术研究基金(A2016592);汕头市医疗科技计划项目(汕府科[2015]123号)
【作者简介】吴丽丽,高级工程师,医学物理师,主要从事放射物理工作,E-mail: liliwustu@gmail.com
【通信作者】张武哲,高级工程师,主要从事放射物理研究,E-mail: 14032426@qq.com
更新日期/Last Update: 2017-11-23