[1]靳怀志,石俊田,戴振晖,等. Optical Surface Monitoring系统跟踪运动靶区的位置精度和剂量精度验证[J].中国医学物理学杂志,2019,36(6):641-646.[doi:DOI:10.3969/j.issn.1005-202X.2019.06.005]
　JIN Huaizhi,SHI Juntian,DAI Zhenhui,et al. Verification of the accuracy of localization and dose based on optical surface monitoring system for tracking moving targets[J].Chinese Journal of Medical Physics,2019,36(6):641-646.[doi:DOI:10.3969/j.issn.1005-202X.2019.06.005]
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 Optical Surface Monitoring系统跟踪运动靶区的位置精度和剂量精度验证()
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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6期
页码:
641-646
栏目:
医学放射物理
出版日期:
2019-06-25

文章信息/Info

Title:
 Verification of the accuracy of localization and dose based on optical surface monitoring system for tracking moving targets
文章编号:
1005-202X（2019）06-0641-06
作者:
 靳怀志1; 石俊田2; 戴振晖1; 王学涛1
 1.广州中医药大学第二附属医院放射治疗区， 广东 广州 510006； 2.中山大学孙逸仙纪念医院放疗专科， 广东 广州 510120
Author(s):
 JIN Huaizhi1;  SHI Juntian2;  DAI Zhenhui1;  WANG Xuetao1
 1. Radiotherapy Area, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510006, China; 2. Department of Radiotherapy, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
关键词:
 ; Optical Surface Monitoring System; 锥形束CT; 运动跟踪; 模体; 放射剂量; 位置精度
Keywords:
 ; Keywords: optical surface monitoring system;  cone beam computed tomography;  motion tracking;  phantom;  radiotherapic dosage;  location accuracy
分类号:
R318；TL72
DOI:
DOI:10.3969/j.issn.1005-202X.2019.06.005
文献标志码:
A
摘要:
 目的：评估Optical Surface Monitoring System（OSMS）测量靶区运动的几何精度和使用OSMS跟踪运动靶区放疗时的剂量精度。方法：[①]分别使用OSMS与锥形束CT监测腹部模体的位置，通过移动治疗床使模体产生位移和旋转，对比二者对模体位置的测量结果；[②]用呼吸运动平台搭载MatriXX二维电离室阵列，测量不同跟踪阈值时模体内相对剂量，分别与计划剂量分布对比，分析不同跟踪阈值时计划验证的gamma通过率。结果：OSMS和锥形束CT系统对模体平移和旋转预设偏移的测量结果差异很小，使用OSMS门控技术时OSMS的阈值越小gamma通过率越高，相对剂量分布与计划剂量的一致性也越好。结论：OSMS系统对模体表面位置监测精度高，可以应用到实际放射治疗的辅助摆位。使用OSMS门控技术跟踪运动靶区可以提高靶区的剂量精度，而且对患者不附加任何电离辐射，适合应用于分次间的辅助摆位和分次内的靶区跟踪。
Abstract:
 Abstract: Objective To evaluate the geometric accuracy of target motion measurement and dose accuracy in radiotherapy with optical surface monitoring system (OSMS) to track moving targets. Methods The positions of abdominal phantom were monitored with OSMS and cone beam computed tomography (CBCT), separately. The displacement and rotation of the phantom were achieved by moving treatment couch. Finally, the measurements of phantom position between two methods were compared. MatriXX two-dimensional ionization chamber array mounted on a respiratory motion platform was used to measure the relative dose in phantom under different tracking thresholds. The obtained doses were compared with planned doses, thereby analyzing the gamma passing rates of verification plans with different tracking thresholds. Results The difference between OSMS and CBCT system in measuring the preset displacements of phantom translation and rotation was trivial. When using OSMS gating technology, the smaller the threshold of OSMS was, the higher the gamma pass rate was, and the consistency between relative dose distribution and planned dose was better. Conclusion OSMS which has a high accuracy in monitoring the phantom surface position can be applied to the assistant positioning in radiotherapy. Using OSMS gating technology to track moving targets can improve the dose accuracy of target areas, without adding ionizing radiation to patients. OSMS is suitable for inter-fractional assistant positioning and inter-fractional target tracking.

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备注/Memo

备注/Memo:
 【收稿日期】2018-12-26
【基金项目】广东省科技厅自筹经费类项目（2017ZC0165）；广东省医学科研基金（A2019196）
【作者简介】靳怀志，工程师，主要从事肿瘤放射治疗工作，E-mail: huaizhijin@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: 2019-06-25