Application of Karl Different Grade Iterative Reconstruction Technique Combined with CAD
in Chronic Obstructive Pulmonary Disease
LIU Liangjin1，FANG Jicheng2，HU Junwu1
1. Department of Radiology, Hubei No.3 People’s Hospital of Jianghan University, Wuhan Hubei 430033, China| 2. Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan Hubei 430000, China
Abstract：Objective To explore the influence of Karl’s different level iterative reconstruction technology on the image quality of CT chest scan of COPD. Methods 115 patients from July 2017 to July 2019 with COPD were selected in our study. All patients received conventional dose (120 kV, 150 mAs) CT examination at the first time and low dose (120 kV, 80 mAs) CT when reexamination. The images were reconstructed by filtered back projection (FBP) and 1-9 level Karl iterative reconstruction. Then the lobes were segmented and the bronchi were measured by computer aided diagnosis (CAD), and statistics were performed between the two groups, such as the lung volume (LV), the percentage of the low attenuation area of the total lung volume of the double lungs lower than -910 HU (LAA-910%), LAA-950%, emphysema index (EI), mean lung density (MLD). Results There was no significant difference in the LV, LAA-910%, LAA-950%, EI and MLD among conventional dose FBP, low-dose FBP and different Karl iteration levels (P>0.05). However, for the conventional dose FBP, LV, LAA-910%, LAA-950%, and EI were lower than the low-dose FBP and different Karl iteration levels, while MLD was higher than low-dose FBP and different Karl iteration levels. For the low-dose different Karl iteration levels LAA-950%, EI were lower than low-dose FBP, and Karl iteration level increased, while LAA-950% and EI decreased. There was no significant difference in the number, length and volume of bronchus between the conventional dose FBP, low dose FBP and different Karl iteration levels (P>0.05). Conclusion Karl iterative reconstruction technology with different levels has important application in chronic obstructive pulmonary disease, which can effectively ensure the image quality in low-dose scanning.
刘良进1，方纪成2，胡军武1. Karl不同等级迭代重建技术联合CAD在慢性阻塞d性肺疾病中的应用研究[J]. 中国医疗设备, 2020, 35(10): 186-190.
LIU Liangjin1，FANG Jicheng2，HU Junwu1. Application of Karl Different Grade Iterative Reconstruction Technique Combined with CAD
in Chronic Obstructive Pulmonary Disease. China Medical Devices, 2020, 35(10): 186-190.
Hyungjin K,Jin MG,Yoshiharu O,et al.Effect of reconstruction parameters on the quantitative analysis of chest computed tomography[J].J Thorac Imaging,2019,34(2):1.
