ASIR技术对肝脏增强CT检查图像质量及辐射剂量影响的自身对照研究-论文.pdf

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1、·l084·临床放射学杂志2o14年第33卷第7期技术探索ASIR技术对肝脏增强CT检查图像质量及辐射剂量影响的自身对照研究万象新，孙源源，李昊翔，肖喜刚【摘要】目的分析自适应统计迭代重组(ASIR)技术在降低肝脏增强cT扫描中辐射剂量的作用。方法选取42例行肝脏增强CT检查患者，在3～9个月先后行2次CT扫描。分别行传统的滤过反投影法(FBP)和ASIR技术重组图像。比较2种重组技术在肝实质和腹主动脉内的噪声以及主观图像质量，测量比较两次检查肝脏的CT容积剂量指数(CTDI。)与有效辐射剂量(E

2、D)。结果42例受检者FBP重组CTDI。l和ED分别为(16．2±9)mGy、(7．9±5．8)mSv；ASIR重组CTDI。】和ED分别为(9．8±5．3)mGy、(4．8±2．6)mSv，两次检查的剂量差异有统计学意义(P<0．05)。低剂量ASIR技术成像噪声要低于常规剂量FBP成像噪声(P<0．05)。主观图像质量评分无统计学意义(P>0．05)。结论与传统cT重组图像的FBP相比，ASIR技术在肝脏增强cT扫描中辐射剂量可显著降低，而图像噪声却显著降低。【关键词】自适应统计迭代重组辐射

3、剂量图像质量TheInfluenceASIRTechniqueontheHepaticEnhancedCTImageQualityandRadiationDose：ASelf-ControlStudyWANXiangxin，SUNYuanyuan，LIHaoxiang，etalDepartmentofRadiology，theThirdPeople’SHospital，Sanyan，HainanProvince572000，P．R．China【Abstract】ObjectiveToanalyze

4、theeffectofadaptivestatisticaliterativereconstruction(ASIR)techniqueonthere—ductionofradiationdoseinhepaticcontrast—enhancedCTscanning，andtocomparethistechniquewithroutinedosehepaticCTscanningwithfilteredbackprojection(FBP)．MethodsAtotalof42patientswe

5、reenrolledinthisstudy，including27malesand15females．TwotimesofCTscanningwereperformedinallpatientswithin3—9months．TheimageswerereconstructedwithFBPandASIRseparately．Theimagenoiseinabdominalaortaandthesubjectiveimagequalitywerede—termined，andtheresultsw

6、erecomparedbetweenthetwotechniques．ThevolumeCTdoseindex(CTDI。1)andtheeffec—tivedose(ED)werecalculated．ResultsUsingFBPreconstructiontechniquethemeanCTDI。landEDwere(16．2±9)mGyand(7．9±5．8)mSvrespectively，whileusingASIRtechniquethemeanCTDI。landEDwere(9．8±

7、5．3)mGyand(4．8±2．6)mSvrespectively．Thedifferencesbetweenthetwotechniqueswerestatisticallysignificant(P<0．05)．Theimagenoiseoflow—doseASIRtechniquewaslowerthanthatofroutinedoseFBPtechnique(P<0．05)．Nostatisticallysignificantdifferenceinsubjectiveimagequa

8、lityexistedbetweenthetwotechniques(P>0．05)．ConclusionComparedwithconventionalfiheredbackproj‘ectionCTimagereconstructiontechnique，ASIRtechniquecanstrikinglydecreasetheradiationdoseandreducetheimagenoiseinhepaticenhancedCTscanning．【Keywords】Ada