腰围结合剂量指数在儿童腰椎低剂量CT检查的应用  

Application of waist circumference combined with dose index in low dose lumbar CT examination of children

作　　者：陆洋 王莎莎 边传振 朱明水 LU Yang;WANG Shasha;BIAN Chuanzhen;ZHU Mingshui(Department of Radiology,Children’s Hospital Affiliated to Nanjing Medical University,Nanjing 210008,China)

机构地区：[1]南京医科大学附属儿童医院放射科,江苏南京210008

出　　处：《分子影像学杂志》2024年第7期746-749,共4页Journal of Molecular Imaging

基　　金：江苏省妇幼保健协会科研项目(FYX201918)。

摘　　要：目的 探讨剂量指数(DRI)结合腰围在降低儿童腰椎CT检查辐射剂量的可行性。方法 将2021年1月~2022年10月在南京医科大学附属儿童医学行腰椎CT检查的300例患儿依据其腰围进行分组,腰围≤45 cm为A组(n=120),45 cm<腰围≤50 cm为B组(n=100),腰围>50 cm为C组(n=80);将每组患儿再随机分配到不同的亚组,各亚组对应不同的DRI值,扫描管电压为100 kV,采用DoseRight自动曝光控制技术,采用iDose4重建算法重建CT图像,对其质量进行主观、客观评价,对各组CT检查的容积CT剂量指数和剂量长度乘积作对比分析。结果 在图像质量能满足最低诊断需求的前提下,A组各亚组DRI最小为9,B组为11,C组为13;A、B、C组图像在椎间盘区及椎旁肌肉区信噪比均随着DRI的增加而增加,差异有统计学意义(P<0.01);A、B、C组的容积CT剂量指数和剂量长度乘积均是随DRI的减小而降低,差异有统计学意义(P<0.01)。结论 DRI与腰围相结合,能够为儿童腰椎CT扫描个性化方案的制定提供指导。Objective To investigate the feasibility of DRI combined with waist circumference in reducing radiation dose of lumbar CT examination in children.Methods A total of 300 children who underwent lumbar spine CT examination at the Children's Medicine Affiliated to Nanjing Medical University from January 2021 to October 2022 were divided into groups according to their waist circumferences,with a waist circumference of≤45 cm for group A,a waist circumference of 45-50 cm for group B,and a waist circumference of>50 cm for group C,the children in each group were randomly assigned to different subgroups,each subgroup corresponded to different DRI values,the scanning tube voltage was 100 kV,the DoseRight automatic exposure control technology was used,the iDose4 reconstruction algorithm was used to reconstruct the CT images,and the quality of the images were subjectively and objectively evaluated,and the CTDIVOL and DLP of each group were compared and analyzed.Results When the DRI of group A was 9,group B was 11,and group C was 13,the image quality can meet the minimum diagnostic requirements,the SNR in the intervertebral disc region and the paravertebral muscle region of the three groups increased with the increase of DRI,and the difference was statistically significant(P<0.01),the CTDIVOL and DLP of the three groups decreased with the decrease of DRI(P<0.01).Conclusion The combination of DRI and waist circumference can provide guidance for the development of an individualized plan for lumbar CT scan in children.

关 键 词：儿童 容积CT剂量指数 剂量指数 腰围 

分 类 号：R726.8[医药卫生—儿科] R816.92[医药卫生—临床医学]