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不同比例多模型迭代重建对“三低”CT门静脉成像图像质量的影响 预览

Impact of different proportions of adaptive statistical iterative reconstruction veo on image quality of"three-low"CT portal venography
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摘要 目的 探讨不同比例多模型迭代重建(ASIR-V)对“三低”(低对比剂用量、低辐射剂量、低管电压)CT门静脉成像(CTPV)图像质量的影响。方法 收集80例接受CT腹部增强扫描患者,随机分为A组(n=40)和B组(n=40)。A组采用常规扫描,前置ASIR-V为0,管电压120 kV,对比剂用量450 mgI/kg体质量,滤波反投影法(FBP)重建;B组采用“三低”扫描,前置ASIR-V比例40%,管电压100 kV,对比剂用量350 mgI/kg体质量,分别采用FBP重建和10%~100%ASIR-V(间隔10%)重建。测量门静脉主干、门静脉左支、门静脉右支CT值及SD值,计算SNR和CNR;由2名医师对图像质量进行主观评分,比较不同扫描和重建方法间图像质量、辐射剂量和碘摄入量的差异。结果 B组有效辐射剂量、对比剂碘摄入量较A组分别减少55.47%和19.30%(P均<0.001)。12种重建图像上,门静脉主干、左支和右支CT值差异无统计学意义(P均>0.05)。B组图像SD值随ASIR-V权重比例增加而逐渐降低,SNR和CNR逐渐升高(P均<0.05);40%~100%ASIR-V门静脉重建图像SD值低于A组图像(120 kV-FBP),SNR和CNR均高于A组图像(120 kV-FBP,P均<0.05)。B组重建图像中,50%~100%ASIR-V门静脉重建图像主观评分均高于A组图像(120 kV-FBP,P均<0.05),其中80%ASIR-V重建图像主观评分最高。结论 “三低”CTPV中,后置ASIR-V重建可显著降低门静脉图像噪声、提高图像质量,采用80%ASIR-V重建算法可获得最佳门静脉图像。 Objective To explore the impact of different proportions of adaptive statistical iterative reconstruction veo(ASIR-V)on image quality of"three-low"(low contrast media,low radiation dose,low tube voltage)CT portal venography(CTPV).Methods Totally 80 patients who underwent abdominal enhanced CT were enrolled and randomly divided into group A(n=40)and group B(n=40).Patients in group A were examined with conventional scanning with pre-set ASIR-V ratio as 0,tube voltage as 120 kV and contrast agent dose as 450 mgI/kg,and the images then were reconstructed with filtered back projection(FBP).Patients in group B were scanned with"three-low"technique with pre-set ASIR-V ratio as 40%,tube voltage as 100 kV and contrast agent dose as 350 mgI/kg,and then the images were reconstructed with FBP and 10%-100%ASIR-V(reconstruction interval was 10%).CT values and standard deviation(SD)of the main portal vein,the left and right branch of portal vein were measured to calculate SNR and CNR.The image quality was subjectively scored by 2 radiologists.The differences of image quality,radiation dose and iodine intake among different scanning protocols and reconstruction algorithms were compared.Results Compared with group A,effective radiation dose and iodine intake of contrast agent in group B reduced by 55.47%and 19.30%,respectively(all P<0.001).There was no significant difference of CT value of portal vein and the branches among 12 kinds of reconstructive images(all P>0.05).In group B,SD value decreased gradually while SNR and CNR increased gradually with the increase of ASIR-V ratio(all P<0.05).SD values in group B with 40%-100%ASIR-V image was respectively lower than 120 kV-FBP image in group A,while SNR and CNR was respectively higher than 120 kV-FBP image in group A(all P<0.05).The subjective score with 50%-100%ASIR-V in group B was respectively higher than 120 kV-FBP image in group A(all P<0.05),among which 80%ASIR-V reconstructive images obtained the highest score.Conclusion ASIR-V reconstruction can significantly reduce the ima
作者 任占丽 胡智军 李豆 唐慧 雷雨欣 贾永军 张喜荣 于楠 于勇 贺太平 REN Zhanli;HU Zhijun;LI Dou;TANG Hui;LEI Yuxin;JIA Yongjun;ZHANG Xirong;YU Nan;YU Yong;HE Taiping(College of Medical Technology,Shaanxi University of Chinese Medicine,Xianyang 712000,China;Department of Medical Imaging,the Affiliated Hospital of Shaanxi University of Chinese Medicine,Xianyang 712000,China;Department of Medical Imaging,Chang'an Hospital,Xi'an 710016,China)
出处 《中国医学影像技术》 CSCD 北大核心 2018年第10期1568-1573,共6页 Chinese Journal of Medical Imaging Technology
关键词 迭代重建 对比剂 辐射剂量 图像质量 门静脉成像 Iterative reconstruction Contrast media Radiation dose Image quality Portal venography
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