|本期目录/Table of Contents|

射波刀椎体追踪方式治疗腰椎转移肿瘤的体位误差分析

《现代肿瘤医学》[ISSN:1672-4992/CN:61-1415/R]

期数:
2019年20期
页码:
3695-3698
栏目:
论着(放射治疗)
出版日期:
2019-09-08

文章信息/Info

Title:
Analysis of the posture errors of Cyberknife therapy for lumbar metastatic tumor using X sight spine tracking system
作者:
赵田地;?庄洪卿;?王 巍;?姜树坤;?王俊杰
北京大学第三医院肿瘤放射治疗科,北京 100191
Author(s):
Zhao Tiandi;?Zhuang Hongqing;?Wang Wei;?Jiang Shukun;?Wang Junjie
Department of Radiation Oncology,Peking University Third Hospital,Beijing 100191,China.
关键词:
射波刀;?腰椎转移肿瘤;?体位误差;?立体定向放射治疗
Keywords:
Cyberknife;?lumbar metastatic tumor;?posture errors;?stereotactic body radiation therapy
分类号:
R730.55
DOI:
10.3969/j.issn.1672-4992.2019.20.033
文献标识码:
A
qq自动领红包软件:
目的:通过采用射波刀进行腰椎转移肿瘤的放射治疗,并且利用交叉视野脊柱追踪技术得出误差结果并进行分析,并对临床上靶区设计提供参考数据。方法:选择我科室2017年10月至2019年4月接受射波刀治疗的14例腰椎转移肿瘤患者,中位年龄63岁(46~83岁)。患者根据临床要求采用仰卧位、真空垫固定,十字中心激光定位。在治疗过程中应用交叉视野脊柱追踪技术对靶区位置进行校正,行立体定向放射治疗(stereotactic body radiation therapy,SBRT)3~5次。每隔90 s采集一次正交图像并与参考数字图像(digital reconstructedly radiograph,DRR)行自动配比后记录误差值。分析治疗过程中采样点的随机误差,根据van Herk等人提出的MPTV=2.5Σ+0.7σ公式进行计算临床靶区(clinical target volume,CTV)到计划靶区(planning target volume,PTV)的外扩边界范围。结果:通过治疗过程中采集到6个方向上共749组数据分析得出,三个线性方向体位误差(系统误差±随机误差):X轴的偏差为(0.37±0.27)mm,Y轴的偏差为(0.29±0.22)mm,Z轴的偏差为(0.34±0.27)mm;三个旋转方向体位误差(系统误差±随机误差):L-R偏差为(0.30±0.21)°、DOWN-UP偏差为(0.25±0.20)°和CCW-CW偏差为(0.39±0.26)°。以上结果得出三个线性方向X、Y、Z的外放边界分别为1.11 mm、0.88 mm、1.04 mm。结论:腰椎肿瘤使用射波刀交叉视野脊柱追踪进行的椎体追踪技术可为临床靶区外放提供可靠的依据。
Abstract:
Objective:To analyze the errors of the radiotherapy of the lumbar metastatic tumor with X sight spine tracking of Cyberknife and provide the references for clinical target design.Methods:Fourteen lumbar metastatic tumor patients undergoing Cyberknife treatment were chosen in my department from October 2017 to April 2019,whose median age was 63 years old (from 46 to 83 years old).The patients who keep supine position were fixed with vacuum pad using the laster positioning method according to the clinic requirements.During the treatment,they were corrected their position with X sight spine tracking system,and treated by stereotactic body radiation therapy (SBRT) for 3~5 times.Orthogonal images were collected once every 90 seconds and the errors were recorded after they were matched automatically with digital reconstructedly radiograph (DRR).The outer boundary range of from clinical target volume (CTV) to planning target volume (PTV) was caculated according to the formula MPTV=2.5Σ+0.7σ by van Herk.etc by analyzing the random errors of sampling points during the treatment.Results:The three linear posture errors (system error±random error) of X-axis,Y-axis and Z-axis were (0.37±0.27) mm,(0.29±0.22) mm and (0.34±0.27) mm and the three rotational posture errors (system error±random error) of L-R,DOWN-UP and CCW-CW were (0.30±0.21)°,(0.25±0.20)° and (0.39±0.26)°,which were analyzed by collecting 749 data from the six directions during the treatment.So target volumn margin of the three linear directions of X,Y and Z were 1.11 mm,0.88 mm and 1.04 mm.Conclusion:The errors of the radiotherapy of the lumbar metastatic tumor with X sight spine tracking system can provide clinical target margin with reliable basis.

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备注/Memo

备注/Memo:
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更新日期/Last Update: 1900-01-01