颞骨的msct混合重建与局部解剖比较

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1、Structureoftemporalbone：ComparingofhybridrenderingofMSCTandtopographicanatomyIntroductionRecently，manystudiesaboutpostprocessingmethodsofspiralCTofthetemporalbonehavebeenreported．Theauthorsconcludedthat：thesemethodswereconsideredacomplementarytechniquetoconventionalCT，andprovidingbettervisionaldet

2、ailsofthecomplexstructuresoftemporalbone；thesetechniquesmayhaveanimportantroleinpreoperativeplanning，surgicaltrainingand／orpostoperativeevaluation；SincetheparametersofCTscanningandthresholdofre-constructionplaysanimportantroleinvisualizationoftheanatomicstructure，Itisnecessarytohaveacomparisonofre

3、constructedimagesandlocalanatomy．Hybridrenderingmethodfcolor—coded3Dshadedsurfacedis-playandvolumedisplay)oftemporalbonehasnotbeenreportedinChinauntilnOW．Theaimsofthisstudyareasfollowed：firstvisuali—zingtheimportantstructureoftemporalbonebyhybridrenderingmethod；second，convincingthatthereconstructi

4、veimageissomewhatobjectivebycomparingthereconstructiveimageswithrealstructureoflocalanatomy；finallytryingtohavesurgicaltraining0ntherecon。structedtissueusingthesoftwareofworkstation．Sevenformalin—fixedcadaverswerescannedwithmultiplespiralCT(PhilipsMX8000)TheHRSCTSCanparameterswere：120kv，244mas，bea

5、mcollimation0．6，Pitch0．875and512512matrix，recon。·5·structionincrement0．2．Afterscanningwasfinish，eachsideoftem-poralbonewasseparatelyreconstructedwith90mmfieldofview．Theaxialimagedatasetsweretransferrddtoaindependentworkstation(Silicongraphics0．2)．Usingaossicleasacriteriontodeterminethewindowlevela

6、ndwindowwidthforossicleSSDreconstruction．Alltheossicleswerere．constructedwiththiswindowlevelandwindowwidth．StructuresofOS．sicles，facialnerve，sigmoidsinuses，andlabrinthinesweresegmentedusinganinteractivethresholdintervaldensityvollHne——growingmeth-·odandvisualizedwithacolor—codedSSDrenderingmethod．

7、Thetemporalbonewasvisualizingusingatransparentvolumerenderingmethod．OntheworkstationmaximumlengthofincusofSSDreconstruc·tionanddistancebetweenthesigmoidsinusandexternalauditorymea-tusanddistancebetweensigmoidsinu