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1、1680临床放射学杂志2009年第28卷第12期技术探索双源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
2、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
3、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,NanjingGen
4、eralHospitalofNanjingMilitaryCommand,Nanjing,JiangsuProvince210002,P.R.ChinaAbstractObjectiveToinvestigatethefeasibilityofdua-lenergyvirtualnoncontrastCT(VNCT)ofdualsourceCTinupperAbdomen.MaterialsandMethods46patientswhoweresuspectedwithintrahepaticlesionsw
5、erereferredtoperformabdominalCTscan.Conventional(CNCT),arterialandportalphaseenhancedscanningwereperformedwithdua-lenergymode(80kV/400mAand140kV/96mA).ThededicatedsoftwareofLiverVNCwasusedtoreformatvirtualnonen-hancedCTatthearterialandportalphase.Imagequality,ra
6、diationdose,theaverageCTvalue,signaltonoiseratio,andle-siondetectabilitywerecompared.ResultsRadiationdoses,averageCTvalueoftheliverandspleenhadnostatisticaldifferenceamongconventionalnonenhancedCTandvirtualnonenhancedCTatthearterialandportalphase(P>0.05).SNRofV
7、NCTwasmuchhigherthanthatofconventionalnonenhancedCT(P=0.00),twosetsofVNCThadnodifference(P>0.05).ImagequalityoftwoVNCTwasdecreasedcomparedwithconventionalnonenhancedCT(F=241.80,P=0.00),butithadatleastmoderateimagequalitytomeetimagingdiagnosis.Arterialphaseimageq
8、ualityofVNCTwassu-periortothatofportalvenousphase(P=0.004).VNCTandconventionalCTscanhadsimilarperformanceforthedetec-tionoflesions.ConclusionComparedwiththeportalven