亚毫米ct对肝外胆管供血小动脉的初步观察

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1、硕士学位论文(370mgI／mL)．4．Examingmethods：GastrointestinalpreparationforconventionalphaseIIIepigastrialscanningwasperformed．ScanningtimeusingCTscanning、^，itllcontrastagentautomatictrackingwasdetermined，monitoringspotsestablishedattheabdominalaortaoftheceliactrunklevel，themonitoring

2、stallwasstartedandthescanningbeganwhenthemonitoredvaluereached200HUafter8Sdelay．ThescanningrangeWaSsetfromthediaphragmaticdometoinferiorpoleofkidneys，usingbandagecompressionoraskingthepatientstoholdbreaths．Contrastagentatadosageof80-100mLwasinjectedusingintravenousbolusinjec

3、tion、析tllhighpressureinjectorviaantecubitalveinatarateof5mL／s，40-50mLsalineWasinjectedatthesamerateflushpipefortubewashing．Thescanningparameters：tubevoltageof120kV,tubecurrentof200mms，detectorlayerof64x0．625mm,apitchof0．891，bedvelocityof47．5mm]s，reconstructionrotationtimeof0

4、．5S，thicknessof0．5rnm,reconstructionintervalof0．5mm．5．Imagesprocessing：Atcompletionofscanning，theoriginalarterialphaseimagesoftransversesurfacewerereconstructedintotransverseaxialimagesatalayerthicknessandalayerintervalofO．625lnnl，谢tllimagesfromplainscanning，parenchymalphase

5、，andlagperiodconstructedinconventionallayerthicknessandinterval．Whenallimageswereuploadedontotheworkstation，theimagesatarterialphasewereinvestigated，othersatotherphasesusedforauxiliaryidentificationofadjacenttissuesanatomically．Thewindowwidthofthearterialphaseimageswereadjus

6、tedfortrackingobservationofconsecutivethinlayersourceimages，multiplanarreconstruction，maximumintensityprojectionimagingandvolumerenderingSOthateventuallytheCTangiographicimageswereachieved．Inthefollowing，theextrahepaticbileductanditsbloodsupplyarteriolesweredetectedtotrackth

7、esourceofthearteriolesandtheirtrends，whichwerefurtherverifiedandjudgedusingmultiplanarreconstruction,maximumintensityprojectionandvolumerendering．ABSTRACT6．Outcomemeasures：Twoexperiencedphysiciansinimagingdiagnosiswereinvitedtomakeblindfilmreadingstojudgethesource，numberandd

8、istributionsofbloodsupplyarteriolesofextrahepaticbileductusingacontinuousth