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1、低剂量颖骨螺旋CT扫描技术的临床应用王东军罗利彬黑龙江省牡丹江医学院附属二院157011［摘要］方法昇吏用GELightSpeed4层螺旋CT扫描机，在其它扫描参数不变情况-卜,分别以100mA和50mA管电流进行颛骨轴位和冠状位扫描。应用图像融合技术，重建出2组冠状位、2组轴位图像。全部图像行高分辩率骨密度算法，再利用MPR技术对4组数据分别重组轴位和冠状位图像。全部40例单次扫描加权CT剂量指数（CTDIw）值，均按机器设备育接显示记录。结果：通过对颖骨低剂量多层螺旋CT扫描技术的临床研究，证明
2、采用低剂量扫描，曝光量由10（）mA降至50mA,单次扫描CTDIw值下降达50%,图像噪声虽增大，但不影响解剖结构的显示。能够满足对屮耳炎、颖骨病变、外伤骨折、先天性耳崎形筛查及耳蜗植入的诊断要求。意义：由于颍骨解剖结构具有天然高对比，应用高分辨CT扫描技术，通过单纯降低mA值来减少射线量。在能较好的保证诊断质量前提下，使受检者的照射剂量明显减少，降低检杳费用、缩短检查时间和减少管球消耗。［关键词］颖骨低剂量多层螺旋CT屮图分类号R445文献标识码AClinicalApplicationofLow
3、-dosageTemporal-boneSpiralCTTechnologyDongjunWangLibinLuoTheSecondAffiliatedHospitalofMudanjiangCollegeMudanjiang［Abstract］:Methods:Withoutchangingalltheotherparameters,GELightSpeed4-layerspiralCTwasusedtoscanthetemporalboneandcoronapositionsrespective
4、lywith100mAand50mAtubecurrent.2groupsofcoronapositionimagesand2groupsofaxispositionimageswererebuiltthroughimagefusion.Allthepicturesarecalculatedwiththemethodoffull-resolutionbonedensity,theaxispositionimagesandcoronapositionimagesofthe4froupaofdatawe
5、rerecombined.Thevaluesofallthe40-casescanningweightingCTDIwwererecordedaccordingtowhatthemachinesshowed・Results:ThroughtheclinicalstudyonCTscanningtechnologyoflow-dosagemulti-layeroftemporalbone,itisprovedthatbyusinglow-dosagescanning,reducingexposuref
6、rom100mAto50mA,andreducingonesingleCTDIwvalueby50%,althoughthenoiseIftheimagesincrease,itwillnotaffecttheexposureofanatomicstructure.Itcanmeetthediagnosticrequirementfortympanitis,temporalbonediseases,trauma,fracture,inbornear-malformation,andcochleaim
7、plantation.Significance:Astemporalbonehasthecharacterofnaturallyhighrelativeproperty,usinghigh-resolutionCTscanningtechnologyandreducingmAvalueswillleadtothereductionofradial.Onthepremiseofhigh-qualitydiagnosis,theexposuredosageofthetestesisobviouslyre
8、duced・Itsavestheexpenseofmedicalcheck,shortenstimeandreducetheconsumptionoftubeKeywords:temporalbone,low-dosage,multi-laye『spiralCT耳部解剖精细、复杂，部分重要结构深藏于颖骨岩部之屮，以往影像学检杳主要依靠普通X线摄影和常规CT扫描，对于局部解剖结构和病理变化的观察不够满意。随着螺旋CT,特别是多层螺旋CT的推广应用，颛骨高分辨率CT（HR
