DWI和MRA在急性脑梗死诊断中的应用分析

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1、中文摘要结论：DWI在脑梗死超急性期和急性期均具有很高的敏感性，发病在6—72小时的梗死灶在DWI上具有较高的信号强度和清晰度；联合应用DWI和T2WI可以对新旧梗死灶加以鉴别；DWI在对呈卒中样发病的病人鉴别诊断方面具有较高的应用价值。72小时内梗死灶的ADC值均低于健侧，且rADC值一直保持较低水平。MRA能很好的显示颅内大血管的狭窄和闭塞，大面积病灶的病人MRA上均可见大血管的闭塞或狭窄；DWI所显示病灶与MRA上血管异常有很好的相关性。关键词：扩散加权成像：磁共振血管成像；脑梗死；表观扩散系数

2、；评价研究英文摘要Appliedstudyofdiffusion-weightedimagingandmagneticresonanceangiographyinthediagnosisofacutecerebralinfarctionobjective：Thepurposeofimagingevaluationinstrokewastodistinguishischemicfromhemorrhagicstroke，thentodetectandlocateischemiclesionandlear

3、nabouttheabnormalityofcranialvessels．DWIhadhighsensibility,specificityandaccuracywhileCTandconventionalMRwerenormalinhyperacutecerebralischemia．MRAcouldnon—invasivelyshowednumber,positionanddegreeofabnormalcranialvesselsandcollateralcirculation．Conseque

4、ntlyDWIandMRAhadbecometwoimportantaspectsofimagingevaluationinacutecerebralinfarction．AlotofdiseasesdisplayedlikestrokeinclinicalexperienceandresearchesofDWIondifferentialdiagnosisinthesediseaseswerglimited．ThedinicalvalueofcombinMionapplicationofDWIand

5、MRAonimagingevaluationinacuteischemicstrokeshouldbediscussed．Inthecurrentstudy,wesystematicallysoughttodeterminetheclinicalusefulnessofDWIandMRAinacutestroke，especiallywithin6hoursstroke，andtoseeifDWIcouldprovidemoreinformationthanT2WI．Inaddition，wewant

6、edto4英文摘要showthefeaturesandregularityofrelateapparentdiffusioncoefficient(rAt)c)within72hoursstroke．Further,therelationshipbetweenDWIandMRAwhichcombinedintracranialparenchymalandpossibleunderlyingvesselsabnormalitywereevaluated．Atlast，applied．valueofDWI

7、ondifferentialdiagnosisofstrokelikesymptomswereprimarilydiscussed．Methods：66patientswithonsetstrokelikesymptomswerecollected．ExclusionofhemorrhagebycrscanbeforeMRimaging，acutecerebralinfarctionWasdiagnosedviaclinicalmanifestationandMRIin56patients(male3

8、2，female24)．DWIWasperformedusingechoplanarimaging(EPI)ona3．0TsuperconductingMRwholebodysysteminallandMRAWasperformedin加ofthemusing3D-TOF．Thepatientsweredividedintofourgroupsaccordingtotime：6h(n=18)，6—24h(n=12)，24-48h(n=10)and48—7