基于迭代重建算法的IDream重建技术对低剂量上腹部CT图像质量及肝囊肿显示的影响  

Effect of IDream reconstruction technique based on iterative reconstruction algorithm on image quality of low-dose CT on upper abdomen and the displays of hepatic cyst

作　　者：叶鹏 杜华阳 李正军 王曼[2] 王沄[2] 梁煜坤 方捷 Ye Peng;Du Huayang;Li Zhengjun;Wang Man;Wang Yun;Liang Yukun;Fang Jie(Imaging Center of Medical Radiography,Ankang Central Hospital,Ankang 725000,China;Department of Radiology,Peking Union Medical College Hospital,Beijing 100730,China;SinoVision Technology(Beijing)Co.,Ltd.,Beijing 100176,China)

机构地区：[1]安康市中心医院医学放射影像中心,安康725000 [2]北京协和医院放射科,北京100730 [3]赛诺威盛科技(北京)股份有限公司,北京100176

出　　处：《中国医学装备》2025年第1期13-18,共6页China Medical Equipment

摘　　要：目的:通过对迭代重建算法的IDream重建技术中不同重建等级肝囊肿CT图像显示的主观评估和上腹部图像质量的客观评价,探讨IDream重建技术降低图像噪声、优化图像质量及显示肝囊肿的最佳重建等级。方法:回顾性收集2021年8月至9月在北京协和医院就诊的53例肝囊肿患者上腹CT平扫影像资料,所有患者图像均行滤波反射投影(FBP)、IDream重建1、2、3、4和5级6种方法重建标准窗图像,共获得FBP组、IDream 1~5级组的6组图像。分别测量并记录每组图像肝脏、腹主动脉、竖脊肌、脂肪、脾脏的CT值及标准差(SD)值,计算图像的信噪比(SNR)、对比噪声比(CNR)。由两名8年以上工作经验的CT诊断医师对各组图像肝囊肿的显示进行主观评分。对比不同等级重建图像的客观参数及肝囊肿主观评分。采用单因素方差分析图像的客观参数,肝囊肿显示主观评分行Kruskal-Wallis H检验。结果:6组图像不同重建等级肝脏、腹主动脉、脂肪、竖脊肌、脾脏的CT值差异均无统计学意义(P>0.05)。在FBP组和IDream 1~5级6组图像中,随着重建等级增加,图像SD值逐渐降低,分别为(18.11±5.03)、(15.37±4.97)、(13.26±4.83)、(11.68±4.56)、(10.99±4.36)和(10.60±4.21)Hu。肝脏SNR、CNR随重建等级升高逐渐升高,6组图像SD值、SNR和CNR比较,差异均有统计学意义(F=20.75、17.72、3.15,P<0.05)。FBP组和IDream1~4级组图像肝囊肿主观评分分别为(3.12±0.35)、(3.63±0.46)、(4.02±0.42)、(4.61±0.48)和(4.63±0.48)分,逐渐升高,而IDream5级组图像评分略有降低,为(4.53±0.47)分,IDream 3级组和IDream 4级组图像评分最高。6组重建等级肝囊肿图像的平均主观评分比较,差异有统计学意义(H=192.17,P<0.05);结论:在上腹部CT平扫中,随着IDream重建等级的增加,图像噪声逐渐降低,图像客观参数逐渐提升;IDream3级和4级重建可得到肝囊肿客观评分最优的上腹部图像质量。Objective:To investigate the optimal reconstruction grade of IDream reconstruction technique in reducing image noise,optimizing image quality,and displaying liver cysts through the subjective assessment on the display of computed tomography(CT)image with differently reconstructive grades in IDream reconstruction technique of iterative reconstruction algorithm,and the objective evaluation of image quality of upper abdomen.Methods:The imaging data of CT plain scan of 53 patients with hepatic cysts who underwent plain scans on upper abdomen at Peking Union Medical College Hospital from August to September 2021 were retrospectively collected.All images were reconstructed to standard window images by using 6 kinds of methods that included filtered back projection(FBP)and IDream grades 1 to 5,which resulted in 6 groups of images that included FBP group and IDream grades 1-5.The CT values and standard deviation(SD)values of the liver,abdominal aorta,erector spine muscle,fat and spleen in images of each group were measured and recorded,respectively.The signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of the images were calculated.Two CT diagnostic physicians with more than 8 years of experience conducted subjective scoring for the display in the images of hepatic cysts of each group.The objective parameters and the subjective scores of hepatic cysts of reconstructive images with different grades were compared.A one-way analysis of variance was adopted to analyze the objective parameters,and Kruskal-Wallis H test was conducted on the subjective score of the display of hepatic cysts.Results:There were no statistically significant differences in the CT values among different reconstruction grades on the liver,abdominal aorta,fat,erector spine muscle and spleen(P>0.05).In the FBP group and IDream grades 1 to 5 groups,the SD values of images gradually decreased with the increasing of the reconstruction grades,which were respectively(18.11±5.03),(15.37±4.97),(13.26±4.83),(11.68±4.56),(10.99±4.36)and(10.60±4.21)H

关 键 词：IDream重建技术 计算机断层扫描(CT) 肝囊肿 图像质量 

分 类 号：R816[医药卫生—放射医学]