30t磁共振lava技术和dwi成像对肝硬化门静脉系统和adc值的评价

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1、-------宁夏医科大学硕士分析生学位论文中文摘要结论：1性质不同的肝硬化结节在MRI各序列表现不同的信号特点，可以分析不同的信号特点对肝硬化结节的良恶性进行判断。2LAVA技术和强大的后处理软件相结合，能清晰显示门静脉的走形、分支和血管周围关系，具有安全性高、无放射线辐射、造影剂用量小等优点。3资料证明，门静脉的的变异较小，在本分析中，只发现门静脉三叉分支变异。胃左静脉起源变异较大，可起源于门静脉主干、脾静脉和门静脉与脾静脉汇合处。4肝硬化患者门静脉及其属支和胃左静脉的管径比志愿者增粗，并且随

2、着肝硬化肝功能Child-Pugh分级的增加，管径从志愿者到Child-PughBC分级组逐渐增粗，即Child-PughBC分级组＞Child-PughA分级组＞志愿者组。5肝硬化患者胃左静脉管径≥6mm者，上消化道出血的病例明显增加，可以把胃左静脉管径为6mm作为预测上消化道出血的临界值。6肝硬化肝脏各叶（本分析除尾叶）的ADC值较正常志愿者较小，并且随着肝硬化程度的加深，ADC值逐渐减少，可以利用ADC值客观的评价肝硬化肝纤维化的程度。关键词肝硬化，门静脉，MRI，LAVA，胃左静脉，ADC

3、值-----------II-----------宁夏医科大学硕士分析生学位论文英文摘要EvaluationthePortalSystemandtheADCValueinCirrhosis withtheLAVAandDWITechnologyof3.0T MagneticResonanceImagingABSTRACTSObjective:Toshowtheportalsystemandit’scollateralclearlywiththeLAVAtechnologyof3.0Tmagneti

4、cresonanceimaging.Toinvestigaterelationbetweenthediameterofportalandthedegreeofliverfunctionimpairment.Evaluationtherelationbetweenleftgastricveindilationandtheriskofuppergastrointestinalbleedinginlivercirrhosis.ToprobetheADCvaluediversificationinlive

5、rcirrhosisandwhichfactionaffectit.Methods:Thestudycasesinclude20volunteersand48patientswithcirrhosis.GroupofpatientswithcirrhosisweredividedintoA,BandClevelsbytheChild-Pughclassification.UsingtheLAVAofSIGNAEXCITE3.0GEHCGEHCtechniqueintwogroupsundergoi

6、ngupperabdominalexamination，andusingthemaximumintensityprojection(MIP)inADW4.3workstationtodisplaytheportalandmeasureitsdiameter.Diffusionweightedimagingwasperformedin48cirrhoticpatientsand20healthycontrols(controlgroup)atSIGNAEXCITE3.0GEHCGEHCwhenbva

7、luewas800s/mm.TheADCvalueineachliversegmentswasmeasuredandanalyzedonFunction2software.Results:Thecirrhoticnoduleswereshowedclearlyby3.0Teslamagneticresonance.In48cirrhoticpatients,coulddiscover36patientswithcirrhoticnodules,whichshowincludebignodules/

8、smallnodulesandmixednodules.48cirrhoticpatientsand20volunteers’portalandleftgastricveinshowclearly.Inthecirrhoticpatientsgroup,coulddiscover34patientswithlateralbranchopeningatvaryingdegree.Withliverfunctiondamageddeepening,theportaldiametergr