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ID:32352191
大小:3.72 MB
页数:45页
时间:2019-02-03
《64排螺旋ct优化扫描方案在儿童小气道病变的研究与应用价值》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、重庆医科大学硕士研究生学位论文第二部分儿童支原体肺炎64排CT低剂量薄层重建的影像学表现特点目的:回顾性分析117例儿童支原体肺炎64排CT胸部低剂量扫描VHRCT影像表现,研究儿童支原体肺炎VHRCT重建图像的小气道病变表现特点。方法:对117例临床确诊的儿童支原体肺炎患儿行64排螺旋CT胸部低剂量扫描,管电压:120kV,管电流:50mA,容积数据行0.625mm的VHRCT重建。结果:117例患几中,男77例,女40例,年龄6月~14岁,平均6.7岁士3.1岁。实变共93例,其中节段性叶实变影76例,伴支气管充气征34例,肺节段性部分性不张18例,小叶性实
2、变17例;肺门或纵隔淋巴结肿大37例,胸腔积液36例;气胸3例;纵隔气肿2例。小气道的改变:树芽征59例,小叶中心结节影54例;磨玻璃影15例,马赛克灌注征11例,细支气管扩张26例。结论:儿童支原体肺炎的薄层VHRCT重建图像主要表现为肺实变伴少量胸腔积液和淋巴结肿大;部分病人有小气道改变,主要表现为树芽征或小叶中心结节,可与大片实变并存,也可单独出现,其边缘较模糊、密度较低为特征性。薄层VHRCT重建图像对支原体肺炎小气道病变的诊断有重要价值。关键词:支原体肺炎;儿童;VHRCT:4重庆医科大学硕士研究生学位论文STUDYANDAPPLICATIONONoP
3、TIMIZATIONPROGRAMSINTHEDIGNOSIS0FSMALLAIRWAYDISEASEINCHILDRENABSTRACTPARTONESTUDYONTHEOPTlMIZATIONPROGRAMOF64-SLICESPIRALCTONTHEDISPLAYOFSMALLAlRWAYSObjective:Volumedatesofchildren’SchestCTwereusedtostudythedifferencesoftwodifferentreconstructionalgorithmsandfourreconstructionsliceth
4、icknessindisplayingthesmallairways.Structureofsmallairwaysweredisplayedindifferentradiationdoses.Andtheoptimizationprogram,todisplaythesmallairwaysoflungs,wasresearched.Methods:OOptimalthicknessandoptimalreconstructionalgorithm:Volumedatasof200patientswithchestspiralCT(MSCT)wereretro
5、spectivelyanalysised.VHRCTandstandardalgorithmswereusedtodisplaythesmallairwaysinO.625mm,1.25mm,2.5milland5mm,respectively.AndimagequalityoftwoalgorithmsanddifferentthicknessonthesmallbronchioftheleRlungtipsectionwerecompared.②Doseselection:volumeandconventionalHRCTscaninlungphantomM
6、SCT:5重庆医科大学硕士研究生学位论文tubevoltage120kV,tubecurrent120mA,100mA,80mA,50mA,20mA,respectively.DoseoftwodifferentscanningmethodsanddifferenttubecurrentandtheimagequaliWwerecomparedbetweenHRCTandVHRCT.Results:OTworeconstructionalgorithmsandfourdifferentthicknesswereusedtoobservethesmallstruc
7、tureofsmallairway.Inthesamethickness,VHRCTshowsabetterimagethanthestandardreconstructiontodiscoverthebronchioleofleftapicalsegment.InVHRCT,both0.625mmand1.25mmthicknesscanshowthebronchioleofleftapicalsegmentclearly,therewasnosignificantdifference(P>o.05),butthescoresof0.625nunwashigh
8、erthan1.25mm
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