GE大孔径CT模拟定位机图像CT值稳定性分析  

CT value constancy analysis of GE big bore CT simulation positioning machine image

作　　者：罗丹 彭黎明 陈凤舞 余双 曾佳 LUO Dan;PENG Li-ming;CHEN Feng-wu;YU Shuang;ZENG Jia(Radiotherapy Room,Yichun People’s Hospital,Yichun 336000,Jiangxi,China;Department of Oncology,Yichun People’s Hospital,Yichun 336000,Jiangxi,China)

机构地区：[1]宜春市人民医院放疗室,江西宜春336000 [2]宜春市人民医院肿瘤科,江西宜春336000

出　　处：《生物医学工程与临床》2025年第1期24-28,共5页Biomedical Engineering and Clinical Medicine

基　　金：宜春市指导性科技计划项目(2022ZDJH6092)。

摘　　要：目的连续监测GE大孔径CT模拟定位机图像CT值,分析GE大孔径CT模拟定位机图像CT值的稳定性。方法通过包含9种不同密度物质的插件的Catphan604模体,在GE大孔径CT模拟定位机下,分别使用临床常用的5种扫描协议[头部(RT Head)、头颈部(RT+C+Shoulder)、胸部(RT Chest)、腹部(RT Abdomen)和盆腔部(RT Pelvis)]扫描获取图像,基于RadiAnt软件获取CT值,对获得的60个CT图像序列进行分析。记录5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。对监测期间采集的CT值平均值进行重复测量之方差分析。结果5种扫描协议中,RT Chest扫描协议下与标准值的偏差值最大,RT Head、RT+C+Shoulder、RT Abdomen和RT Pelvis 4种扫描协议的偏差值相对更小。5种协议都分别在最小和最大密度插件(air和teflon)偏差更大(≥37 Hu)。9种插件在5种扫描协议下的CT值表现相对稳定,其中acrylic插件(120 Hu)的CT值与标准值偏差最小(0.4 Hu)。RT Chest协议下CT值最稳定,密度大的两个插件(bone 50%、teflon)与标准值的偏差更大(≥66.33 Hu)。GE大孔径CT模拟定位机图像CT值的稳定性较好,CT平均值方差分析差异无统计学意义(P>0.05)。CT值-电子密度曲线具有较高的重合度。结论GE大孔径CT模拟定位机CT值稳定,为肿瘤放射治疗精准剂量计算保驾护航。Objective To continuously monitor CT value of GE big bore CT simulation positioning machine image,and analyze the stability of CT value of GE big bore CT simulation positioning machine image.Methods The Catphan604 phantom contained 9 different density material plug-in was used,and GE big bore CT simulation positioning machine was used to scan and obtain images according to 5 commonly clinical scanning protocols[head(RT Head),neck and cranial(RT+C+Shoulder),chest(RT Chest),abdomen(RT Abdomen)and pelvic cavity(RT Pelvis)].The CT values were obtained based on RadiAnt software,and the obtained 60 CT image sequences were analyzed.Results Among 5 scanning protocols,RT Chest showed the largest deviation from the standard value,and the deviation values of RT Head,RT+C+Shoulder,RT Abdomen and RT Pelvis were relatively lower.The higher deviation values were existed in air(minimum density)and teflon(maximum density)materials(≥37 Hu).The CT values of 9 plug-in in 5 scanning protocols were relatively stable,and acrylic plug-in(120 Hu)showed the lowest deviation between CT value and standard value(0.4 Hu).The CT value of RT Chest was the most stable,and 2 plug-in with high density(bone 50%,teflon)showed greater deviation from standard value(≥66.33 Hu).The stability of CT value of GE big bore CT simulation positioning machine showed good stability,and there was no significant difference in CT mean variance analysis(P>0.05).The CT value-electron density curve showed high coincidence.Conclusion It is demonstrated that the CT value of GE big bore CT simulation positioning machine is stable,which can be applied in the accurate dose calculation of tumor radiotherapy.

关 键 词：CT模拟定位机 Catphan604模体 CT值 

分 类 号：R197.39[医药卫生—卫生事业管理] R318[医药卫生—公共卫生与预防医学]