Asir-V技术在儿童腹部CT低剂量扫描中的应用
APPLICATION OF ADAPTIVE STATISTICAL ITERATIVE RECONSTRUCTION-V TECHNIQUE OF LOW DOSE CT SCANNING OF CHILDREN'S ABDOMEN
李成龙 1张欣贤 1郝向东 1李钱程1
作者信息
- 1. 徐州市儿童医院医学影像科,江苏徐州 221000
- 折叠
摘要
目的 探讨自适应迭代算法(Asir-V)技术在儿童腹部CT低剂量扫描中的应用价值.方法 腹痛病儿60例,随机分为3组,每组20例.均行CT扫描,扫描参数:螺旋扫描,管电压100 kV;自动管电流10～450 mA,层厚2.5 mm,螺距0.992,噪声指数为9.A组Asir-V为30％,B组Asir-V为50％,C组Asir-V为70％.分别测量3组病人肝门层面、右肾下极层面、耻骨联合层面背部肌肉CT值及标准差(SD)的平均值、剂量长度乘积(DLP),并换算有效剂量(ED).由两位医师进行独立阅片,对图像质量进行主观评分并比较.结果 3组间SD比较,差异无显著性(P＞0.05);随着Asir-V的提高,DLP、ED降低,差异有统计学意义(F=39.397、19.156,q=3.347～12.231,P＜0.05).3组图片图像质量均符合临床诊断要求(≥3分),两位医师阅片一致性良好.结论 随着Asir-V水平的提高,图像噪声保持稳定,辐射剂量有效降低.
Abstract
Objective To assess the application value of adaptive statistical iterative reconstruction V technique (Asir-V) of low dose scanning of abdomen in children.Methods Sixty children with abdominal pain were evenly randomized to three groups as A,B and C.ACT scanning was conducted in all the children with scan parameters as follows:spiral scanning with 100 kV,automatic tube current 10-450 mA,layer thickness 2.5 mm,pitch 0.992,and noise index was 9.The presetting Asir-V percentage was 30％,50％ and 70％ in groups A,B and C,respectively.The mean values of CT and standard deviation (SD) of muscle of the right side of the portal,the lower pole of the right kidney,the back of the pubic symphysis and dose length product (DLP) were measured,respectively.The effective dose (ED) was computed.The CT films were independently read by two doctors and the image quality was subjectively rated and compared.Results The difference in SD between the three groups was not significant (P＞0.05),while the difference was significant with the elevation of Asir-V and decline of DLP and ED (F=39.397,19.156;q=3.347-12.231;P＜0.05).The image quality of the three groups were in line with the requirements of clinical diagnosis (≥3 marks),and the two doctors had good agreement in reading the films.Conclusion With the improvement of Asir-V technique and stabilization of image noise,the radiation dose can be effectively reduced.
关键词
自适应迭代算法/儿童/腹部/低剂量Key words
adaptive statistical iterative reconstruction V/child/abdomen/low dose引用本文复制引用
出版年
2017
NETL
NSTL
维普
万方数据