摘要
目的连续监测瓦里安Trilogy直线加速器图像引导系统锥形束CT图像CT值,分析锥形束CT图像CT值的稳定性。方法2021年9月至2022年8月期间通过包含9种不同密度插件的Catphan604模体,每月定期使用Trilogy直线加速器的kV级锥形束CT(kV-CBCT)于临床常用的4种扫描协议(标准剂量头部SDH、高质量头部HQH、盆腔Pelvis和低密度胸部LDT)下扫描获得图像,并对获得的48个kV-CBCT图像序列进行分析,基于RadiAnt软件获取CT值,记录4种协议下Catphan604模体中9种不同密度插件的平均CT值,并参照标准值进行数据分析。结果瓦里安Trilogy直线加速器图像引导系统锥形束CT图像CT值稳定性较好,CT平均值比较,差异无统计学意义(P=0.204、0.170、0.113、0.140),CT值-电子密度曲线重合度较高。结论瓦里安Trilogy直线加速器图像引导系统锥形束CT图像CT值稳定,可考虑后期用于肿瘤自适应放射治疗(ART)中的剂量计算。
Objective To analyze the stability of CT values of cone-beam CT images,by continuously monitoring the CT values of cone beam CT images in the Varian Trilogy linear accelerator image guidance system.Methods From September 2021 to August 2022,through the Catphan604 module containing nine plug-ins of different densities,images were obtained monthly using kV-cone-beam computed tomography(kV-CBCT)of Trilogy linear accelerator with four commonly used clinical scanning protocols(standard dose head SDH,high quality head HQH,pelvic Pelvis,and low density chest LDT).With the analysis of 48 kV-CBCT image sequences obtained,CT values were obtained using RadiAnt software.The average CT values of 9 different density plugins in the Catphan604 phantom with 4 protocols were recorded and analyzed according to the standard values.Results The cone beam CT images of the Varian Trilogy linear accelerator image guidance system had good stability in CT values,and there were no statistically significant differences in the average CT values(P=0.204,0.170,0.113,0.140).The overlap between CT values and electron density curves was relatively high.Conclusion The cone beam CT images of the Varian Trilogy linear accelerator image guidance system have stable CT values,which can be considered for dose calculation in tumor adaptive radiotherapy in the later stage.
作者
罗丹
何健
梁小芳
陈凤舞
彭黎明
曾佳
Luo Dan;He Jian;Liang Xiaofang;Chen Fengwu;Peng Liming;Zeng Jia(Yichun People's Hospital,YiChun JiangXi 336000,China)
出处
《医疗装备》
2024年第3期3-7,共5页
Medical Equipment
基金
江西省卫生健康委科技计划项目(SKJP220219276)。
