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1、世界科技研究与发展第31卷1期162-164页低剂量颞骨螺旋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:使用GELightSpeed4层螺旋CT扫描机,在其它扫描参数不变情况下,分别以100mA和50mA管电流进行颞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,均按机器设备直接显示记录。结果:通过对颞骨低剂量多层螺旋
2、CT扫描技术的临床研究,证明采用低剂量扫描,曝光量由100mA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。能够满足对中耳炎、颞骨病变、外伤骨折、先天性耳畸形筛查及耳蜗植入的诊断要求。意义:由于颞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,降低检查费用、缩短检查时间和减少管球消耗。[关键词]颞骨低剂量多层螺旋CT中图分类号R445文献标识码AClinicalApplication
3、ofLow-dosageTemporal-boneSpiralCTTechnologyDongjunWangLibinLuoThe SecondAffiliatedHospitalofMudanjiangCollegeMudanjiang[Abstract]:Methods:Withoutchangingalltheotherparameters,GELightSpeed4-layerspiralCTwasusedtoscanthetemporalboneandcoronapositionsrespectively
4、with100mAand50mAtubecurrent.2groupsofcoronapositionimagesand2groupsofaxispositionimageswererebuiltthroughimagefusion.Allthepicturesarecalculatedwiththemethodoffull-resolutionbonedensity.theaxispositionimagesandcoronapositionimagesofthe4froupaofdatawererecombin
5、ed.Thevaluesofallthe40-casescanningweightingCTDIwwererecordedaccordingtowhatthemachinesshowed.Results:ThroughtheclinicalstudyonCTscanningtechnologyoflow-dosagemulti-layeroftemporalbone,itisprovedthatbyusinglow-dosagescanning,reducingexposurefrom100mAto50mA,and
6、reducingonesingleCTDIwvalueby50%,althoughthenoiselftheimagesincrease,itwillnotaffecttheexposureofanatomicstructure.Itcanmeetthediagnosticrequirementfortympanitis,temporalbonediseases,trauma,fracture,inbornear-malformation,andcochleaimplantation.Significance:As
7、temporalbonehasthecharacterofnaturallyhighrelativeproperty,usinghigh-resolutionCTscanningtechnologyandreducingmAvalueswillleadtothereductionofradial.Onthepremiseofhigh-qualitydiagnosis,theexposuredosageofthetestesisobviouslyreduced.Itsavestheexpenseofmedicalch
8、eck,shortenstimeandreducetheconsumptionoftubeKeywords:temporalbone,low-dosage,multi-layerspiralCT耳部解剖精细、复杂,部分重要结构深藏于颞骨岩部之中,以往影像学检查主要依靠普通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