[1]李正贤,赵晶晶,马永乐,等. 医科达XVI锥形束CT头颈部扫描角度优化[J].中国医学物理学杂志,2017,34(11):1106-1109.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.006]
　LI Zhengxian,ZHAO Jingjing,MA Yongle,et al. Optimizing gantry rotation of head and neck scanning for Elekta XVI cone beam CT[J].Chinese Journal of Medical Physics,2017,34(11):1106-1109.[doi:DOI:10.3969/j.issn.1005-202X.2017.11.006]
点击复制

 医科达XVI锥形束CT头颈部扫描角度优化()
分享到：

《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:
1106-1109
栏目:
医学放射物理
出版日期:
2017-11-20

文章信息/Info

Title:
 Optimizing gantry rotation of head and neck scanning for Elekta XVI cone beam CT
文章编号:
1005-202X（2017）11-1106-05
作者:
 李正贤1; 赵晶晶1; 马永乐1; 王博生1; 杨立婷1; 周莉2; 张艺宝3
 1.吉林国文医院放疗科， 吉林 公主岭 136100； 2.四川大学华西医院肿瘤中心（生物治疗国家重点实验室）放射物理技术中心， 四川 成都 610041； 3.北京大学肿瘤医院暨北京市肿瘤防治研究所放疗科/恶性肿瘤发病机制及转化研究教育部重点实验室， 北京 100142
Author(s):
 LI Zhengxian1;  ZHAO Jingjing1;  MA Yongle1;  WANG Bosheng1;  YANG Liting1;  ZHOU Li2;  ZHANG Yibao3
 1. Department of Radiation Oncology, Jilin Guowen Hospital, Gongzhuling 136100, China; 2. Division of Radiation Physics, State Key Laboratory of Biotherapy, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China; 3. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiotherapy, Peking University Cancer Hospital & Institute, Beijing 100142, China
关键词:
 ; 锥形束CT; 参数优化; 影像引导放疗; 成像剂量; 放射防护
Keywords:
 ; Keywords: cone beam CT;  protocol optimization;  image-guided radiotherapy;  imaging dose;  radiological protection
分类号:
R730.55；R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2017.11.006
文献标志码:
A
摘要:
 【摘 要】 目的：比较医科达XVI头颈部标准全弧和快速半弧模式的辐射剂量和图像质量，并优化扫描角度降低辐射敏感器官的剂量。 方法：利用PTW静电计和CT电离室测量头颈CTDI模体正位0、3、9点方向，以及逆时针旋转模体45°后3、0点方向，模拟甲状腺，左、右腮腺和左、右晶体的辐射剂量。同时测量加权CT剂量指数（CTDIw）。除测量标准全弧和半弧外，还通过修改半弧脚本将默认315°~160°机架旋转变更至335°~180°，并对顺/逆时针扫描分别测量。用Catphan503模体评估各参数图像质量。 结果：全弧CTDIw为0.81/0.81 mGy（0°/45°），约是半弧的2倍。优化模式顺时针扫描剂量最低，快速模式顺时针最高，对于甲状腺、左腮腺、左晶体、右晶体、0°和45° CTDIw，前者比后者低3.17%、3.55%、2.04%、1.75%、0.93%和4.18%。角度优化不会对图像质量产生明显影响，但可减少治疗前机架空转时间从而提高效率。 结论：头颈快速模式较标准全弧模式剂量低且图像质量满足临床要求，角度优化后的快速模式可进一步降低敏感器官剂量并提高临床效率。
Abstract:
 Abstract: Objective To compare the irradiation dose and image quality of Elekta XVI head and neck scans using standard full arc and fast partial arc protocols, and reduce the dose to sensitive organs by optimizing gantry rotation. Methods The standard head and neck CTDI phantom at 0, 3, 9 o’clock (upright setup), and 3, 0 o’clock (rotating the phantom by 45o, counter clockwise) were measured using a PTW electrometer and a CT chamber to simulate the irradiation dose to thyroid, left and right parotid, left and right lenses. Weighted CT dose index (CTDIw) of each protocol was also measured. In addition to the measurement of standard full and partial arc scan, the configuration script of partial arc scan was modified, where the gantry rotation was changed from 315o-160o to 335o-180o, and the dose in clockwise and counter clockwise scans were measured, respectively. Image quality was assessed using Catphan 503 phantom. Results CTDIw of standard full arc scanning was 0.81/0.81 mGy (0o/45o), which was about twice of that of partial arc scanning. The optimized partial arc clockwise scan and standard partial arc clockwise scan had the lowest dose and the highest, respectively, and compared with the latter, the former reduced dose to thyroid, left parotid, left lens, right lens, 0o and 45o CTDIw by 3.17%, 3.55%, 2.04%, 1.75%, 0.93% and 4.18%, respectively. Gantry rotation optimization did not affect image quality obviously, but improved clinical efficiency by reducing unnecessary gantry idle time. Conclusion Relative to standard full arc scan, partial arc XVI scan can achieve satisfactory image quality for head and neck at a lower dose. Optimized partial arc protocol can further reduce imaging dose to sensitive organs and improve clinical efficiency.

相似文献/References:

[1]张俊俊,杨 振,柏朋刚,等.运动模体中靶区长度与锥形束CT扫描速度的相关性[J].中国医学物理学杂志,2015,32(02):259.[doi:10.3969/j.issn.1005-202X.2015.02.025]
[2]张一戈,邱小平,陈维军,等.基于图像引导技术对头颈部肿瘤临床摆位误差的剂量学影响[J].中国医学物理学杂志,2015,32(01):25.[doi:10.3969/j.issn.1005-202X.2015.01.007]
[3]李 毅,李文荣,苏 进,等.基于CBCT非小细胞肺癌外放边界研究[J].中国医学物理学杂志,2014,31(04):5006.[doi:10.3969/j.issn.1005-202X.2014.04.008]
[4]翁邓胡,王 建,尹中明,等.基于锥形束CT研究肺癌图像引导放疗的内靶区外放边界值[J].中国医学物理学杂志,2014,31(04):5012.[doi:10.3969/j.issn.1005-202X.2014.04.009]
[5]查元梓,吴晔明,陆冬青,等.应用锥形束CT研究儿童神经母细胞瘤放射治疗的摆位误差[J].中国医学物理学杂志,2014,31(05):5128.[doi:10.3969/j.issn.1005-202X.2014.05.007]
[6]沈奕晨,聂生东.锥形束CT与螺旋CT图像配准算法及其在放疗中的应用[J].中国医学物理学杂志,2014,31(05):5151.[doi:10.3969/j.issn.1005-202X.2014.05.013]
[7]林俊华,魏贤顶,孔旭东,等.kV级锥形束CT在图像引导放疗中的应用[J].中国医学物理学杂志,2014,31(05):5157.[doi:10.3969/j.issn.1005-202X.2014.05.014]
[8]周 琼,周剑良,张一戈,等.基于锥形束CT肺癌放射治疗两种体位固定技术摆位误差的研究[J].中国医学物理学杂志,2014,31(06):5258.[doi:10.3969/j.issn.1005-202X.2014.06.008]
[9]周永强,金献测,易金玲,等.锥形束CT的验收与QA探讨[J].中国医学物理学杂志,2013,30(01):3854.[doi:10.3969/j.issn.1005-202X.2013.01.005]
[10]刘浩,白靖平,李公平,等.锥形束CT图象引导放疗的应用性测试[J].中国医学物理学杂志,2013,30(01):3877.[doi:10.3969/j.issn.1005-202X.2013.01.010]
[11]刘洪源,彭威,杨锐,等. 锥形束CT离线校正肺癌摆位误差[J].中国医学物理学杂志,2016,33(6):573.[doi:10.3969/j.issn.1005-202X.2016.06.007]
　[J].Chinese Journal of Medical Physics,2016,33(11):573.[doi:10.3969/j.issn.1005-202X.2016.06.007]
[12]李毅,唐丰文,张晓智. 基于四维CT和锥形束CT确定非小细胞肺癌放疗靶区外放边界[J].中国医学物理学杂志,2016,33(9):892.[doi:10.3969/j.issn.1005-202X.2016.09.005]
　[J].Chinese Journal of Medical Physics,2016,33(11):892.[doi:10.3969/j.issn.1005-202X.2016.09.005]
[13]蒋璐,邱小平,单国平,等. 鼻咽癌放疗中摆位误差及解剖结构变化对剂量学的影响[J].中国医学物理学杂志,2017,34(4):348.[doi:DOI:10.3969/j.issn.1005-202X.2017.04.006]
[14]门阔,戴建荣,陈辛元,等. 双能锥形束CT线性混合技术提高相对电子密度的准确性[J].中国医学物理学杂志,2017,34(5):433.[doi:DOI:10.3969/j.issn.1005-202X.2017.05.001]
[15]王美娇,张艺宝,李莎,等. 瓦里安千伏级锥形束CT系统间剂量学一致性研究[J].中国医学物理学杂志,2017,34(6):546.[doi:DOI:10.3969/j.issn.1005-202X.2017.06.002]
　[J].Chinese Journal of Medical Physics,2017,34(11):546.[doi:DOI:10.3969/j.issn.1005-202X.2017.06.002]
[16]葛宁,易峰涛,韩栋梁. 真空垫配合热塑膜在脊柱后凸患者体位固定中的应用[J].中国医学物理学杂志,2017,34(9):955.[doi:DOI:10.3969/j.issn.1005-202X.2017.09.019]
　[J].Chinese Journal of Medical Physics,2017,34(11):955.[doi:DOI:10.3969/j.issn.1005-202X.2017.09.019]
[17]田龙,席强,赵鑫,等. 膀胱癌图像引导放疗中基于软组织灰度值与基于内植标记物的锥形束CT校准比较[J].中国医学物理学杂志,2018,35(1):31.[doi:DOI:10.3969/j.issn.1005-202X.2018.01.007]
　TIAN Long,XI Qiang,ZHAO Xin,et al. Comparison of cone beam computed tomography calibrations based on soft tissue grey value and implanted markers in image-guided radiotherapy for bladder cancer[J].Chinese Journal of Medical Physics,2018,35(11):31.[doi:DOI:10.3969/j.issn.1005-202X.2018.01.007]
[18]张俊,朱金汉,庄永东,等. 基于卷积神经网络CT/CBCT影像质量自动分析[J].中国医学物理学杂志,2018,35(5):557.[doi:DOI:10.3969/j.issn.1005-202X.2018.05.012]
　ZHANG Jun,ZHU Jinhan,ZHUANG Yongdong,et al. Automatic analysis of CT/CBCT image quality based on convolutional neural network[J].Chinese Journal of Medical Physics,2018,35(11):557.[doi:DOI:10.3969/j.issn.1005-202X.2018.05.012]
[19]欧阳水根,苏群,陶娜,等.CBCT引导下不同体位子宫肿瘤IMRT摆位误差及其外放边界[J].中国医学物理学杂志,2018,35(10):1122.[doi:DOI:10.3969/j.issn.1005-202X.2018.10.002]
　OUYANG Shuigen,SU Qun,TAO Na,et al. Setup errors and margins of CBCT-guided IMRT in different positions for uterine neoplasms[J].Chinese Journal of Medical Physics,2018,35(11):1122.[doi:DOI:10.3969/j.issn.1005-202X.2018.10.002]
[20]黄家文,张梅芳,刘利彬,等. 鼻咽癌放疗旋转与平移误差的相关性[J].中国医学物理学杂志,2018,35(12):1365.[doi:DOI:10.3969/j.issn.1005-202X.2018.12.001]
　HUANG Jiawen,ZHANG Meifang,LIU Libin,et al. Correlation between rotational errors and translational errors in intensity-modulated radiotherapy for nasopharyngeal carcinoma[J].Chinese Journal of Medical Physics,2018,35(11):1365.[doi:DOI:10.3969/j.issn.1005-202X.2018.12.001]

备注/Memo

备注/Memo:
 【收稿日期】2017-06-20
【基金项目】国家自然科学基金（11505012）；北京市医院管理局“青苗”计划专项经费（QML20151004）；北京市卫生和计划生育委员会首都卫生发展科研专项；北京市自然科学基金（7172048，1174016）；北京大学深化专业学位研究生教育综合改革项目（住院物理师规范化培训体系建设）
【作者简介】李正贤，理学学士，主管技师，研究方向：医学物理，E-mail: lzx8609@126.com
【通信作者】张艺宝，工学博士，高级工程师，硕士生导师，研究方向：医学物理，E-mail: ybzhang66@163.com
更新日期/Last Update: 2017-11-23