3岁以下小儿行低剂量CT定量检测中Karl迭代重建的应用效果及对肺内容纳气体量和密度的影响  

Effects of Karl Iteration reconstruction on lung density and lung volume in low-dose CT quantitative detection in children under 3 years of age

作　　者：张宗根 黄鑫[1] 赵锋[1] 井清清 ZHANG Zong-gen;HUANG Xin;ZHAO Feng;JING Qing-qing(Womnen and Children's Hospital,Xiamen University,Xiamen Maternal and Child Health Care Hospital,Xiamen,Fujian 361001,China)

机构地区：[1]厦门大学附属妇女儿童医院厦门市妇幼保健院,福建厦门361001

出　　处：《中国妇幼保健》2023年第8期1532-1535,共4页Maternal and Child Health Care of China

摘　　要：目的探讨3岁以内小儿行低剂量CT定量检测中Karl迭代重建的应用效果及对肺内容纳气体量和密度的影响。方法回顾性分析2019年1月—2022年1月厦门大学附属妇女儿童医院收治的80例临床中疑似诊断为呼吸系统疾病的3岁以下小儿作为研究对象。采用随机数字表法将研究对象随机分为观察组(40例)采用低剂量CT定量检测,并对观察组收集的图像进行以滤波反投影(FBP)算法与Karl迭代重建技术重建图像,对照组(40例)采用常规剂量CT定量检测,并对对照组收集的图像利用FBP算法进行重建。对两组使用的有效辐射剂量(ED)进行计算,同时测量比较迭代重建技术重建图像与FBP算法重建的图像中的全肺平均肺密度(MLD)和全肺容积(LV)的差异情况,并对比支气管分叉水平的主动脉、胸腺、竖脊肌及前胸壁皮下脂肪噪声值(SD)的平均值与图像质量的差异。结果观察组平均管电流、CTDIvol、DLP及ED分别为(34.26±1.33、3.42±0.97、19.94±3.47、30.27±0.07)均低于对照组(140.64±3.39、7.44±1.76、126.94±6.69、1.92±0.21),差异有统计学意义(P<0.05),观察组ED与对照组比较降低86.73%;观察组MLD、LV、SD(637.14±11.37、361.64±19.77、7.11±1.20)趋势低于对照组(658.94±13.68、373.61±22.69、9.67±2.06,P<0.05),观察组与对照组研究对比SD减少约24.68%;观察组图像质量评价评分情况高于对照组(P<0.05),其中观察组5分人数占比为50%高于对照组22.50%,观察组Karl迭代重建提升了图像质量。结论低剂量CT能有效地定量地测定婴幼儿的MLD、LV结果。Karl迭代重建法可以有效地改善CT的定量分析精度,减少噪声并改善图像质量达到最佳。Objective To investigate the effect of Karl iterative reconstruction in low-dose CT quantitative detection in children under 3 years of age and its effect on the volume and density of lung gas.Methods 80 children under 3 years of age suspected to be diagnosed with respiratory diseases admitted to hospital from January 2019 to January 2022 were retrospectively analyzed as research objects.The study objects were randomly divided into the study group(40 case)using the random number table method for low-dose CT quantitative detection,and the images collected by the study group were reconstructed using the filtered back projection(FBP)algorithm and Karl iterative reconstruction technology,while the control group(40 case)was quantitatively detected using conventional dose CT.The images collected by the control group were reconstructed using FBP algorithm.The effective radiation dose(ED)used by the two groups was calculated,and the differences of whole lung mean lung density(MLD)and whole lung volume(LV)in the images reconstructed by iterative reconstruction technique and those reconstructed by FBP algorithm were measured and compared.The mean value of subcutaneous fat noise(SD)in aorta,thymus,erector spine and anterior chest wall at the level of bronchial bifurcation was compared with the diference in image quality.Results The mean tube current,CTDIvol,DLP and ED of the study group were(34.26±1.33,3.42±0.97,19.94±3.47,30.27±0.07)were lower than those in the control group(140.64±3.39,7.44±1.76,126.94±6.69,1.92±0.21),and the difference was statistically significant(P<0.05).Compared with the control group,ED in the,study group was reduced by 86.73%.The trend of MLD,LV,SD(637.14±11.37,361.64±19.77,7.11±1.20)in the study group was lower than that in the control group(658.94±13.68,373.61±22.69,9.67±2.06,P<0.05).SD decreased by 24.68%in the study group and the control group.The score of image quality evaluation in the research group was higher than that in the control group(P<0.05),and the proportion of 5 points

关 键 词：小儿 Karl迭代重建 肺密度 肺容积 低剂量 

分 类 号：R725.6[医药卫生—儿科]