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ID:34539573
大小:2.03 MB
页数:36页
时间:2019-03-07
《mri在乳腺病变诊断中应用价值研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、山东人学硕十学位论文2.1DCE-MR/:Fordynamiccontrast-enhancedMRimaging.TIhighresolutionisotropicvolumeexcitation(THRIVE)sequenceWasusedinthetransverseplane.TheunenhancedT1weightedimagingWasfollowedby15dynamiccontrast—enhancedsequences。aftertheintravenousbolusinjectionofO.15mmol/kgbodywei
2、ghtofGD—DTPA(Magnevist)intoadorsalveinofhandattherateof2.5ml/sanda15mlsalinesolutionflushattherateof2.0ml/s.2.2DWI:Echoplanarimaging(EPI)sequenceWasperformedonfourbvalues(125s/mnl2,250s/nun2,375s/mm2and500s/mm2)withtheparametersaSfollows:repetitiontime(TR)/echotime(TE),2500m
3、s/62ms;slicethickness,4mm;slicegap,lmm;fieldofview,220mmx220mm;matrix,126x240;scantime,137s.3.Evaluationmethods:3.1DCE—MR/:Weacquiredthebreastlesions’morphologicfeatures,time.signalintensitycurve(TIC)andearlyenhancementraterespectively.Accordingtotheirshapes,TICWasclassified
4、intotypeI,typeIIandtypeIII.TypeIissteadyenhancement.TypeIIisplateauofsignalintensity.TypeIIIiswashoutofsignalintensity.3.2DWI:DWIWasobtainedfromtheworkstation.TheADCvalueswerecalculatedaccordingtoADC=【In(S2/S1)]/(b2一b1),whereSIandS2arethelowandhighsignalintensitiesintheregio
5、nsofinterest(ROI)obtainedwithdifferentbvalues(125---,0,250"--0,375"--0,500---0s/mm2).4.Statisticalassay:TheStudentt-testWasusedtotestthesignificancebetweentheenhancementratesofbenignandmalignantlesions.Andthet.testwasusedtotestthesignificanceofthecurvetypedistributionsontheb
6、enignandmalignantlesions.One·wayANOVAandSNK(Student-Newman—Keuls)wereusedtoanalyzethedifferencesamongthemeanADCvaluesofthemalignantlesions,benignlesionsandnormalfibroglandulartissue.ThedatawasanalyzedusingthesoftwareofSPSS11.0,P<0.05Wasusedtoindicatesignificance.Results:1.48
7、breastlesionswererevealedonMRimagingin39casesincludingsolitarylesionsin33cases,multiplelesionsin6cases.Ofmultiplelesions,unilateralmultiple6山东人学硕士学位论文lesionsin4cases,bilateralmultiplelesionsin2cases.31lesionsin26casesweremalignant.17lesionsin13caseswerebenign.Alllesionswerei
8、dentifiedbyhistopathology.2.MostofthebreastlesionswerelowsignalintensityonT
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