AIIR重建算法对70kVp低管电压扫描主动脉CTA图像质量影响的研究  

Effect of AIIR Reconstruction Algorithm on Image Quality of 70kVp Low Tube Voltage Scanned Aortic CTA

作　　者：游永春 李万江[1] 钟思华 帅桃[1] 刘洪川 李真林[1] YOU Yongchun;LI Wanjiang;ZHONG Sihua;SHUAI Tao;LIU Hongchuan;LI Zhenlin(Department of Radiology,West China Hospital,Sichuan University,Chengdu Sichuan 610041,China;Central Research Institute,United Imaging Healthcare,Shanghai 201870,China)

机构地区：[1]四川大学华西医院放射科,四川成都610041 [2]上海联影医疗科技股份有限公司中央研究院,上海201870

出　　处：《中国医疗设备》2021年第10期75-79,共5页China Medical Devices

基　　金：四川省科技厅重点研发项目(2019YFS0522)。

摘　　要：目的探讨70 kVp低管电压行主动脉CT血管成像(Computed Tomography Angiography,CTA)扫描时,使用人工智能迭代重建(Artificial Intelligence Iterative Reconstruction,AIIR)算法的最佳重建等级。方法前瞻性收集2021年3月至5月在我院行主动脉CTA扫描的50例患者为研究对象,利用原始数据分别重建Karl 5级以及AIIR 1至5级的图像,共得到6组重建图像。使用相同大小的ROI测量6组升主动脉、降主动脉、腹主动脉、左髂动脉及右髂动脉的CT值和SD值、计算信噪比(Signal to Noise Ratio,SNR)和对比噪声比(Contrast to Noise Ratio,CNR),并对图像进行主观评价。结果6组重建图像CT值差异比较,无统计学意义(P>0.05),AIIR 1至5级图像的SD、SNR和CNR均优于Karl组,且SD随着重建等级增加而升高,SNR和CNR则相应降低,差异均有统计学意义(P<0.05)。AIIR 5级总体图像质量主观评分最高,"蜡像"感程度完全可接受,且与Karl 5级算法重建的图像主观评分差异有统计学意义(P<0.05)。结论AIIR重建算法在低剂量扫描条件下能够有效降低主动脉CTA的图像噪声,提高血管的信噪比和对比噪声比,然而在5种AIIR算法中,AIIR 5级图像质量主观评分更高,在低剂量行主动脉CTA扫描时,推荐使用AIIR5级重建图像。Objective To explore the best reconstruction level of artificial intelligence iterative reconstruction in 70 kVp low tube voltage aortic computed tomography angiography(CTA).Methods A total of 50 patients who underwent aortic CTA scan in our hospital from March to May 2021 were prospectively collected.The original data were used to reconstruct the images of Karl 5 and AIIR 1-5,and 6 groups of reconstructed images were obtained.The CT and SD values of ascending aorta,descending aorta,abdominal aorta,left iliac artery and right iliac artery were measured with the same ROI,and the signal to noise ratio(SNR)and contrast to noise ratio(CNR)were calculated.And subjective evaluation of the image were subjectively evaluated.Results There was no significant difference in CT value of reconstructed images among the 6 groups(P>0.05).The SD,SNR and CNR of AIIR grade 1 to 5 images were better than those of Karl group,and SD increased with the increase of reconstruction grade,while SNR and CNR decreased correspondingly(P<0.05).AIIR 5 had the highest subjective score of overall image quality,and"wax figure"was acceptable,and there was a significant difference between the subjective score of AIIR 5 and Karl 5 algorithm(P<0.05).Conclusion AIIR reconstruction algorithm can effectively reduce the image noise of aortic CTA and improve the signal-to-noise ratio and contrast-to-noise ratio of vessels under the condition of low-dose scanning.However,among the five AIIR algorithms,the subjective score of AIIR grade 5 image quality is higher,and it is recommended to use AIIR grade 5 reconstruction image in lowdose aortic CTA scanning.

关 键 词：体层摄影术 X线计算机断层扫描 图像质量 主动脉 人工智能 迭代重建 

分 类 号：R816.2[医药卫生—放射医学] R814.42[医药卫生—临床医学]