[1]祖重阳,虞刚,张传义,等. 一种医用直线加速器多叶光栅的位置检测系统[J].中国医学物理学杂志,2018,35(4):378-383.[doi:DOI:10.3969/j.issn.1005-202X.2018.04.002]
 ZU Chongyang,YU Gang,ZHANG Chuanyi,et al. A position detection system for multi-leaf collimator on medical linear accelerator[J].Chinese Journal of Medical Physics,2018,35(4):378-383.[doi:DOI:10.3969/j.issn.1005-202X.2018.04.002]
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 一种医用直线加速器多叶光栅的位置检测系统()
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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4期
页码:
378-383
栏目:
医学放射物理
出版日期:
2018-04-21

文章信息/Info

Title:
 A position detection system for multi-leaf collimator on medical linear accelerator
文章编号:
1005-202X(2018)04-0378-06
作者:
 祖重阳1虞刚1张传义1路玉昆1仇清涛1侯勇2李登旺1
 1.山东师范大学物理与电子科学学院;山东省医学物理图像处理技术重点实验室, 山东 济南 250000; 2.山东省千佛山医院放疗科, 山东 济南 250000
Author(s):
 ZU Chongyang1 YU Gang1 ZHANG Chuanyi1 LU Yukun1 QIU Qingtao1 HOU Yong2 LI Dengwang1
1. Shandong Province Key Laboratory of Medical Physics and Image Processing Technology; School of Physics and Electronics, Shandong Normal University, Ji’nan 250000, China; 2. Department of Radiotherapy, Qianfo Mountain Hospital of Shandong Province, Ji’nan 250000, China
关键词:
 加速器多叶光栅开源计算机视觉库位置检测相机标定
Keywords:
 accelerator multi-leaf collimator open source computer vision library position detection camera calibration
分类号:
R812;TP751
DOI:
DOI:10.3969/j.issn.1005-202X.2018.04.002
文献标志码:
A
摘要:
 针对医用直线加速器多叶光栅提出一种直接的位置检测设计方案。首先,对光栅叶片前端使用标记物进行标记,将摄像机固定于多叶光栅下等中心位置并对相机进行标定;其次,使用摄像机获取多叶光栅运动的视频图像,并通过通用串行总线传输到个人计算机端;然后,利用相机的标定参数对图像进行矫正,并计算叶片实际位移与图像像素移动个数的比例,最终通过该比例以及像素移动个数来计算标记点的实际位移量。在仿真实验中,使用该方法对38个感兴趣点分别移动2、4、7、11 cm位置进行测试,摄像机可以准确捕捉到38个测试点,结果显示感兴趣测试点位置测算准确,误差均在1 mm以内,满足系统要求。本研究有望为放疗临床治疗过程中多叶光栅自检提供一定的指导。
Abstract:
A direct design proposal is proposed for the position detection system of multi-leaf collimator on medical linear accelerator. Firstly, appropriate markers are made at the front end of the grating blade, and the vidicon is fixed on the center of the multi-leaf collimator, and the camera is calibrated. Then, use the vidicon to obtain the video images of multi-leaf collimator movement, and send them to the PC end through USB 2.0. Subsequently, the obtained images are corrected using the calibration parameters, and the ratio of the actual displacement of blade and the number of image pixels moved is calculated. Finally, the actual displacement of the marked points is determined based on the calculated ratio and number of image pixels moved. During the simulation test, 38 interested points are moved over an distance of 2, 4, 7 and 11 cm, respectively, and the test results showed that the vidicon accurately capture the 38 test points. The position calculation of the interested points utilizing this method is accurate with the error less than 1 mm, which meets the requirements of the system. This research is expected to provide some guidance for the self-inspection of multi-leaf collimator in the radiotherapy.

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备注/Memo

备注/Memo:
 【收稿日期】2017-11-30
【基金项目】国家自然科学基金(61471226);山东省自然科学杰出青年基金(JQ201516);山东省自然科学基金(ZR2017BF005)
【作者简介】祖重阳,硕士研究生,研究方向:医学图像处理,E-mail: chongyang_zu@163.com
【通信作者】李登旺,教授,博士生导师,研究方向:医学图像处理技术及临床应用、光医学信号处理技术, E-mail: lidengwang@sdnu.edu.cn
更新日期/Last Update: 2018-04-23