作者单位:210002江苏,南京军区南京总医院医学影像科;*通讯作者�技术探索�双源CT双能量上腹部虚拟平扫临床应用价值的初步探讨彭�晋,张龙江,吴新生,周长圣,马�延,顾海峰,季学满,卢光明*�摘要��目的�探讨双源CT(dualsourcecomputedtomography,DSCT)上腹部双能量虚拟平扫临床应用的可行性。资料与方法�对46例临床拟诊上腹部病变患者行DSCT上腹部常规平扫(CNCT)及动脉期、门静脉期双能量扫描(80kV/404mA和140kV/96mA)。利用LiverVNC软件处理分别得到动脉期、门静脉期2组虚拟平扫数据,并与CNCT对照,比较三者在图像质量、辐射剂量、平均CT值、信噪比(SNR)及病灶检出上差异的统计学意义。结果�3次扫描患者接受的辐射剂量、所测肝、脾平均CT值的差异无统计学意义(P>0.05);虚拟平扫图像SNR明显高于CNCT组(P=0.00),2组虚拟平扫之间差异无统计学意义(P>0.05);虚拟平扫的图像质量较CNCT有所下降(F=241.80,P=0.00),但可满足临床诊断需求,动脉期虚拟平扫图像质量优于门静脉期(P=0.004);虚拟平扫和CNCT病灶检出性能相似。结论�相对门静脉期而言,肝动脉期的双能量虚拟平扫能提供更好的图像质量,可满足诊断需要,并可减少一次平扫的辐射剂量,具有更高的SNR、相似的病灶检出性能,具有潜在的临床应用价值。�关键词��体层摄影术,X线计算机�虚拟平扫�信号噪声比�辐射剂量APreliminaryStudyofDualEnergyVirtualNon-ContrastCTofDualSourceCTinUpperAbdomenPENGJin,ZHANGLongjiang,WUXinsheng,eta.lDepartmentofMedicalImaging,NanjingGeneralHospitalofNanjingMilitaryCommand,Nanjing,JiangsuProvince210002,P.R.China�Abstract��Objective�Toinvestigatethefeasibilityofdua-lenergyvirtualnoncontrastCT(VNCT)ofdualsourceCTinupperAbdomen.MaterialsandMethods�46patientswhoweresuspectedwithintrahepaticlesionswerereferredtoperformabdominalCTscan.Conventional(CNCT),arterialandportalphaseenhancedscanningwereperformedwithdua-lenergymode(80kV/400mAand140kV/96mA).ThededicatedsoftwareofLiverVNCwasusedtoreformatvirtualnonen-hancedCTatthearterialandportalphase.Imagequality,radiationdose,theaverageCTvalue,signaltonoiseratio,andle-siondetectabilitywerecompared.Results�Radiationdoses,averageCTvalueoftheliverandspleenhadnostatisticaldifferenceamongconventionalnonenhancedCTandvirtualnonenhancedCTatthearterialandportalphase(P>0.05).SNRofVNCTwasmuchhigherthanthatofconventionalnonenhancedCT(P=0.00),twosetsofVNCThadnodifference(P>0.05).ImagequalityoftwoVNCTwasdecreasedcomparedwithconventionalnonenhancedCT(F=241.80,P=0.00),butithadatleastmoderateimagequalitytomeetimagingdiagnosis.ArterialphaseimagequalityofVNCTwassu-periortothatofportalvenousphase(P=0.004).VNCTandconventionalCTscanhadsimilarperformanceforthedetec-tionoflesions.Conclusion�Comparedwiththeportalvenousphase,thehepaticarterialphaseofdua-lenergyVNCTcanprovidebetterimagequality,meetingtheneedsofthediagnosis.Reducedradiationdose,ahighersignaltonoiseratioandsimilarlesiondetectionperformanceofVNCTcomparedwithconventionalnonenhancedCT,ithasapotentialclinicalroleintheabdomen.�Keywords��Tomography,X-raycomputed�Virtualnoncontrast�Signa-lto-noise�Radiationdose��随着双源CT(dualsourcecomputedtomography,DSCT)双能量扫描技术的不断发展,目前已用于全身多个部位病变的临床检查和诊断。利用DSCT内相互垂直的两个球管和探测器,通过一次扫描就可同时获得低能和高能两组图像,有利于鉴别对比增�1680�临床放射学杂志2009年第28卷第12期强的结构和实质器官中的不同密度物质,而且两组数据不存在位置和时间差,利用LiverVNC软件通过双能量算法能够得到虚拟平扫(virtralnoncon-tras,tVNC)图像,具有很好的临床应用潜力。本研究旨在探讨上腹部VNC与普通平扫在图像质量、辐射剂量、CT值、信噪比(signa-lto-noiseratio,...
