ADMIRE对不同体重指数人群支气管动脉CT成像的影响

Effect of advanced modeled iterative reconstruction on bronchial artery CT imaging in people with different body mass index

目的:探讨高级迭代重建算法(ADMIRE)对不同体重指数(BMI)人群支气管动脉CT成像的影响,并筛选出最适迭代重建强度。方法:51例患者行基于ADMIRE(强度1~5)的支气管动脉CT成像检查,根据患者BMI分为体重过轻组(BMI<18.5 kg/m^(2))、体重正常组(18.5≤BMI<24.0 kg/m^(2))及体重超重组(BMI≥24.0 kg/m^(2))。对比3组患者支气管动脉管径以及不同ADMIRE强度下3组患者支气管动脉CT成像质量的主客观评分,筛选最适迭代重建强度。结果:3组不同BMI患者支气管动脉的管径及各组间相同ADMIRE强度下CT图像的主观评分及客观评价指标比较,差异均无统计学意义(P>0.05)。各组图像噪声值均随ADMIRE强度增高而显著降低,体重正常组和体重超重组的信噪比(SNR)、对比噪声比(CNR)数值随ADMIRE强度增高而明显增高;组内两两比较显示,体重正常组在ADMIRE 5强度下的SNR、体重超重组在ADMIRE 5强度下的SNR和CNR,与组内其他迭代强度比较均有统计学差异(P<0.05)。体重超重组中ADMIRE 4的主观评分明显高于迭代强度1~3(P<0.05);体重正常组中ADMIRE 4与ADMIRE 5的主观评分相近(P>0.05),但ADMIRE 4的可判读性(96.3%)高于ADMIRE 5(92.6%)。结论:支气管动脉管径不受BMI的影响,体重正常组与体重超重组在支气管动脉CT成像时推荐使用ADMIRE 4或ADMIRE 5为显示支气管动脉的最适迭代强度级别。

Objective:To explore the effect of advanced iterative reconstruction algorithm(ADMIRE)on CT imaging of bronchial artery(BA)in people with different body mass index(BMI),and the best iterative reconstruction intensity was screened out.Methods:Fifty-one patients underwent BA CT imaging based on ADMIRE(intensity 1~5).According to BMI,they were divided into underweight group(BMI<18.5 kg/m^(2)),normal weight group(18.5 kg/m^(2)≤BMI<24.0 kg/m^(2)),overweight group(BMI≥24.0 kg/m^(2)).The BA diameter of the 3 groups and the subjective and objective scores of BA imaging quality under different ADMIRE intensities were compared to screen the optimal iterative reconstruction intensity.Results:There were no significant differences in the diameter of BA and the subjective and objective scores under the same ADMIRE intensity among the 3 groups(P>0.05).The image noise of each group decreased significantly with the increase of ADMIRE intensity,and the signal-to-noise ratio(SNR)and contrast to noise ratio(CNR)of normal weight group and overweight group increased significantly with the increase of ADMIRE intensity.Pair comparison of the same group showed that the SNR of the normal weight group under ADMIRE 5 intensity was statistically different from other iterative intensities and the SNR and CNR of the overweight group under ADMIRE 5 intensity were significantly different from other iterative intensities(P<0.05).The subjective score of ADMIRE 4 in the overweight group was significantly higher than the iterative intensity of 1-3(P<0.05);the subjective scores of ADMIRE 4 and ADMIRE 5 in the normal weight group were similar(P>005),but the readability of ADMIRE 4(96.3%)is higher than that of ADMIRE 5(92.6%).Conclusion:The diameter of BA was not affected by BMI.ADMIRE 4 and ADMIRE 5 were recommended as the optimal iterative intensity level for displaying BA in the normal weight group and overweight group during BA CT imaging.