刘建军,吕发金,罗猛
LIU Jianjun,LV Fajin,LUO Meng

• 1:双流区第一人民医院
• 2:重庆医科大学附属第一医院
• 3:贵州省人民医院胸外科

摘要(Abstract)：

目的:分析CT检查中i Dose4迭代重建(AIR)与滤波反投影重建技术(FBP)在体检人群肺部病变筛查中的应用。方法:分析行常规体检的1 600例临床资料,按照体检表尾号分为AIR组(658例)和FBP组(942例);两组体检者又根据CT检查时的管电流分为25、50及100 mA·s组,对比不同管电流检查时肺部有效辐射剂量,并比较不同管电流及重建方式下获得的扫描图像的平均CT标准差、信噪比(SNR)、噪声比(CNR)及图像质量。结果:25 mA·s组、50 mA·s组有效辐射剂量较100 mA·s组显著降低,差异有统计学意义(P<0.05),不同管电流及重建方式下各组平均CT标准差差异无统计学意义(P>0.05);50 mA·s条件下,获得的AIR图像的SNR、CNR较FBP时增高;25及50 mA·s条件下,获得的FBP图像质量评分较100 mA·s条件下降低(P<0.05);25及50 mA·s条件下,获得的AIR图像质量评分较FBP时增高,差异有统计学意义(P<0.05)。结论:体检人群肺部病变筛查中FBP降低辐射剂量后图像质量明显下降,而AIR在降低肺组织有效辐射剂量时不影响扫描图像质量。
Objective: To analyze the application of iDose4 iterative reconstruction( AIR) in CT examination and filtered back-projection( FBP) in screening of lung lesions in physical check. Methods: The clinical data of 1,600 people who received routine physical check were retrospectively analyzed. They were divided into AIR group( 658 cases) and FBP group( 942 cases) according to the end number of report form. Meanwhile,both groups were further divided into 25,50 and 100 mA·s groups according to the tube electricity current in CT examination. The effective radiation doses of lung under different tube currents were compared between the two groups. The average CT standard deviation,signal to noise ratio( SNR),contrast noise ratio( CNR) and image quality obtained under different tube currents and reconstruction methods were also compared. Results: The effective radiation dose in 25 mA · s group and 50 mA · s group were significantly lowered than that in 100 mA · s group,difference was statistically significant( P < 0. 05). There was no significant difference in the mean CT standard deviation between different tube currents and reconstruction modes( P > 0. 05).Under 50 mA·s,SNR and CR of AIR images were higher than those of FBP,difference was statistically significant( P < 0. 05). Under 25 mA·s and 50 mA·s,the image quality scores of FBP were lower than that under 100 mA·s( P < 0. 05),while the image quality scores of AIR were higher than that under 100 mA·s( P < 0. 05). Conclusion: The image quality decreased significantly after FBP decreased the radiation dose in the screening of lung lesions in physical examination population. However,AIR can reduce the effective radiation dose of the lung tissue without affecting the image quality.

关键词(KeyWords)： 辐射剂量;迭代重建;滤波及投影重建;图像质量;计算机体层成像;肺部病变
radiation dose;iterative reconstruction;filtering and projection reconstruction;image quality;computed tomography;lung lesions

Abstract:

Keywords:

基金项目(Foundation): 四川省卫生和计划生育委员会科研课题(17PJ298)

作者(Author): 刘建军,吕发金,罗猛
LIU Jianjun,LV Fajin,LUO Meng

DOI: 10.19367/j.cnki.1000-2707.2018.08.018

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