摘要
目的运用千伏级的锥形束CT(cone beam CT,CBCT)图像引导扫描技术,研究平均床值法摆位技术在颈椎骨转移瘤调强放疗中应用的可行性。方法每位患者总共扫描30次CBCT,记录每次左右方向x、前后方向y、上下方向z三个方向的数值,取前5次CBCT扫描平均值_5=(x_1+x_2+…x_5)/5,_5=(y_1+y_2+…y_5)/5,_5=(z_1+z_2+…z_5)/5,作为日后摆位床值,与物理师的计划床值x_0、y_0、z_0进行分析,前5次左右方向摆位平均误差Lat_5=_5-x_0,前后方向摆位平均误差Lng_5=_5-y_0,上下方向摆位平均误差Vrt_5=_5-z_0,用前5次摆位误差的平均值表示系统误差,用所有分次的摆位误差的标准差表示随机误差,进行独立t检验。结果平均床值法摆位技术的系统误差和随机误差无显著性差异(P>0.05),在左右、前后、上下三个维度的误差都<0.3 cm,在允许范围内。结论平均床值法摆位技术运用在颈椎骨转移瘤的调强放疗是可行的。
Objective Using KV cone beam CT（ cone beam CT,CBCT） image boot scanning technology,to investigate the feasibility of average values of bed method placement technology in intensity modulated radiation therapy（ IMRT） for cervical vertebra bone metastases. Methods Each patient was given CBCT scan for 30 times and record the value of three directions each time,including left and right（ X） 、before and rear（ Y） and up and down（ Z）,take the mean of the previous five times =（ x1＋ x2＋ …x5）/5,=（ y1＋ y2＋ …y5）/5, =（ z1＋ z2＋ …z5）/5,as the value of bed positioning and compare with physicist planned bed value x0,y0,z0. to compute the average upset error,which on X axis is Lat5= 5-x0,Y axis is Lng5= 5-y0,Z axis is Vrt5= 5-z0. Consider the mean of the first five setup errors as the system error and consider the standard deviation of the setup errors in all times as the random error to conduct independent t-test. Results Statistical analysis of system error and random error there was no significant difference（ P〉 0. 05）,the left and right,front and back,up and down three dimension error is 0. 3 cm within the allowable range. Conclusion The application of average values of bed method placement technology in IMRT for cervical vertebra bone metastases is feasible.
作者
张扬帆
毕金玲
黄勇
ZHANG Yangfan;BI Jingling;HUANG Yong(Department of Oncology,Guangde Road,Hefei Second People＇s Hospital,Hefei 230011 China)
出处
《中国辐射卫生》
2018年第4期339-341,共3页
Chinese Journal of Radiological Health
关键词
平均床值
摆位误差
CBCT扫描技术
颈椎骨转移瘤
调强放疗
The Average Value of Bed
Beam Position Error
CBCT Scanning Technology
Cervical Vertebra Bone Metastases
IMRT
