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时间:2020-04-12
《低浓度对比剂能谱CT单能量成像对提高门静脉图像质量的研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、360放射学实践2015年4月第3O卷第4期RadiolPractice,Apr2015,Vol30,No.4腹部影像学低浓度对比剂能谱CT单能量成像对提高门静脉图像质量的研究张龙敏,刘爱连,刘义军,佟梓滨,浦仁旺,刘晓峰【摘要】目的:探讨宝石CT能谱成像最佳对比噪声比(CNR)单能量图像对提高低浓度对比剂门静脉成像质量的应用价值。方法:将符合纳入标准的136例患者随机分为2组,A组采用高浓度对比剂(350mgI/100mL)和常规CT扫描(1.25mm层厚)、B组采用低浓度对比剂(270ragI/100mL)和宝
2、石CT能谱成像(GSI)。由两位放射科医师采用双盲法分别测量两组图像上门静脉左支、右支和肝实质的cT值及图像噪声,对两位观察者的测量结果采用组内一致性系数(ICC)进行分析;采用较高年资观察者的测量结果,计算门静脉的对比噪声比(cNR),并对两组的测量结果及CNR值分别行t检验;经图像后处理,分剐获得两组图像的VR和MIP重组图像并进行图像质量的主观评分,对2位医师的图像质量评分采用Kappa检验,并采用较高年资观察者的评分结果和秩和检验法对2组间的图像质量进行比较。结果:B组中门静脉最佳CNR单能量图像的能量水平
3、集中在50KeV左右。两位观察者测量数据的一致性较好(ICC>0.75)。A组中门静脉左支、门静脉右支和肝实质的CT值及背景噪声(sD值)分别为(178.38±27.25)、(174.78士24.66)、(116.13士17.01)和(32.78±4.72)HU,B组分别为(334.01±58.74)、(328.51±55.78)、(187.89士32.23)和(39.12土1O.05)HU,这4个测量指标在两组间的差异均有统计学意叉(P<0.05)。B组中门静脉左、右支与肝实质的CNR(分别为4.O8土1.9O和
4、3.93±1.80)均高于A组(分别为1.92±0.68和1.8O±0.59),两组间差异有统计学意义(P均5、机;能谱成像;单能量图像;图像质量【中图分类号】R814.42;R543.6【文献标识码】A【文章编号】1000一O313(2O15)O4—0360—04D0I:10.13609/i.cnki.1000—0313.2O15.04.014Studyontheeffectofmonochromaticimageswithbestcontrast-to-noiseratiousingspectralCTforimprovingtheimagingqual_ityofportographyusinglow-concentr6、ationcontrastmediumZHANGLong—min,LIUAi—lian,LIUYi—jun,eta1.[Abstract]Objective:ToinvestigatetheeffectofspectralCTmonochromaticimageswiththebestcontrast-to—noiseratio(CNR)forimprovingtheimagingqualityofportographyusinglow—concentrationcontrastmedium.Methods:Acc7、ord—ingtotheinclusioncriteria,136patientswereselectedandrandomlydividedintotwogroupsforportography:ingroupA,contrastmediumwithhighconcentration(350mg1/100mL)andconventionalCTwereused;andingroupB,low-concentra—tioncontrastmedium(270mg1/100mL)andgemstonespectral8、imaging(GSI)wereused.CTvalueofliverparenchyma,left—andright—portalvein,andimagenoiseonportographyimagesweremeasuredindependentlyandblindedbytworadiolo—gists,andtheresultsoftwoobser
5、机;能谱成像;单能量图像;图像质量【中图分类号】R814.42;R543.6【文献标识码】A【文章编号】1000一O313(2O15)O4—0360—04D0I:10.13609/i.cnki.1000—0313.2O15.04.014Studyontheeffectofmonochromaticimageswithbestcontrast-to-noiseratiousingspectralCTforimprovingtheimagingqual_ityofportographyusinglow-concentr
6、ationcontrastmediumZHANGLong—min,LIUAi—lian,LIUYi—jun,eta1.[Abstract]Objective:ToinvestigatetheeffectofspectralCTmonochromaticimageswiththebestcontrast-to—noiseratio(CNR)forimprovingtheimagingqualityofportographyusinglow—concentrationcontrastmedium.Methods:Acc
7、ord—ingtotheinclusioncriteria,136patientswereselectedandrandomlydividedintotwogroupsforportography:ingroupA,contrastmediumwithhighconcentration(350mg1/100mL)andconventionalCTwereused;andingroupB,low-concentra—tioncontrastmedium(270mg1/100mL)andgemstonespectral
8、imaging(GSI)wereused.CTvalueofliverparenchyma,left—andright—portalvein,andimagenoiseonportographyimagesweremeasuredindependentlyandblindedbytworadiolo—gists,andtheresultsoftwoobser
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