[1]戴振晖,张白霖,朱琳,等. Edge加速器Calypso 4D电磁定位系统精确性评估[J].中国医学物理学杂志,2018,35(5):497-502.[doi:DOI:10.3969/j.issn.1005-202X.2018.05.001]
　DAI Zhenhui,ZHANG Bailin,ZHU Lin,et al. Evaluation of the accuracy of Calypso 4D electromagnetic localization system in Edge accelerator[J].Chinese Journal of Medical Physics,2018,35(5):497-502.[doi:DOI:10.3969/j.issn.1005-202X.2018.05.001]
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 Edge加速器Calypso 4D电磁定位系统精确性评估()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
35卷
期数:
2018年第5期
页码:
497-502
栏目:
医学放射物理
出版日期:
2018-05-22

文章信息/Info

Title:
 Evaluation of the accuracy of Calypso 4D electromagnetic localization system in Edge accelerator
文章编号:
1005-202X（2018）05-0497-06
作者:
 戴振晖1; 张白霖1; 朱琳1; 朱远湖1; 杨耕1; 蔡春雅1; 李飞1; 张煜2; 王学涛1
 1.广东省中医院放射治疗区， 广东 广州 510006； 2.南方医科大学生物医学工程学院， 广东 广州 510515
Author(s):
 DAI Zhenhui1;  ZHANG Bailin1;  ZHU Lin1;  ZHU Yuanhu1;  YANG Geng1;  CAI Chunya1;  LI Fei1;  ZHANG Yu2;  WANG Xuetao1
 1. Department of Radiation Therapy, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510006, China;
2. School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China
关键词:
 ; Calypso; 电磁定位; 射线; 体模
Keywords:
 ; Calypso;  electromagnetic localization;  ray;  phantom
分类号:
R144.1；TL72
DOI:
DOI:10.3969/j.issn.1005-202X.2018.05.001
文献标志码:
A
摘要:
 目的：研究Calypso 4D 电磁定位系统的几何精度和电磁阵列对加速器射线的衰减。 方法：分别把植入式转发器和表面转发器安装在体模上，对比Calypso测量的体模等中心位移和实际位移，分析系统的定位精度；使用指型电离室测量有和没有电磁阵列时固体水内剂量，验证电磁阵列对射线的衰减；重复测量相同位置的体模等中心，评估系统稳定性。 结果：植入式转发器的定位精度是（0.02[±]0.01） cm，表面转发器的定位精度是（0.01[±0.01]） cm；在机架角325°到35°范围内，6和10 MV能量电磁阵列对加速器射束的衰减低于2%，在305°和55°衰减低于3.4%；重复测量时出现偏移的标准差在0.012 cm以内。 结论：Calypso系统定位精度能够稳定在亚毫米级，电磁阵列对射线的衰减在临床接受范围内，Calypso 4D电磁定位系统是精确、可靠的，能够大大提高放疗精度。
Abstract:
 Objective To evaluate the geometric accuracy of Calypso 4D electromagnetic localization system and study the attenuation of ray caused by electromagnetic array. Methods Implantable transponders and superficial transponders were placed in the phantom, separately. The localization precision was analyzed by comparing the displacement of the phantom isocenter measured with Calypso and actual displacement, and the attenuation of ray caused by electromagnetic array was evaluated by measuring the dose of solid water with and without electromagnetic array. The phantom isocenter at the same position was measured repetitively for assessing the system stability. Results The accuracies of implantable and superficial transponders were (0.02[±0.01]) cm and (0.01[±0.01]) cm. The attenuation caused by electromagnetic array was below 2% for both 6 MV and 10 MV energies at gantry angles between 325° and 35°, and was lower than 3.4% at gantry angles of 305° and 55°. The standard deviation of displacement was within 0.012 cm in repeated measurements. Conclusion The accuracy of Calypso localization system is steadily at submillimeter level, meanwhile, the attenuation of ray caused by electromagnetic array is clinically insignificant. Calypso 4D electromagnetic localization system which is accurate and reliable can greatly improve the accuracy of radiotherapy.

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备注/Memo

备注/Memo:
 【收稿日期】2018-03-02
【基金项目】国家自然科学基金（61671230）；广东省科技计划项目（2017ZC0153）
【作者简介】戴振晖，工程师，主要从事肿瘤放射物理工作，E-mail:dzh_dzh@126.com
【通信作者】王学涛，主任技师，主要从事肿瘤放射物理工作，E-mail: wangxuetao0625@126.com
更新日期/Last Update: 2018-05-22