婴幼儿呼吸频率对不同螺距模式下胸部双源CT辐射剂量和图像质量的影响

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[Abstract]Objective：Toinvestigatetheefectof infantrespiratoryrateonchestCTradiationdoseandimagequalityinhigh pitch mode（HPM）andlowpitch mode（LPM）.Methods：Eighty infantsunderwentchestCTandwere divided into HPM group（40 cases）andLPMgroup（40cases）.Among the80cases，52cases hadhighrespiratoryrate（RR），28 hadlow RR. ThevolumeCTdoseindex（CTDIvol），doselengthproduct（DLP）andeffectivedose（ED），overscandistance，objective andsubjectiveimagequalityat diferentRRof thetwogroups werecompared.Results：EDvaluesof HPMand LPM groups were （ 3.31±0.28） ，（1.79±0.15） mSv，the overscan distances were（ 6.54±5.94， ），（4.02±2.51） cm，and the differences werestatistically significant（both P <0.05）．The image quality scores of HPM group were better than those of LPM group（motionartifactscoresof1.6and2.3points，subjectivescoresof3.6and3.1points，espetively），withsatisialy significant differences（ P =0.002，0.O04）.The patients at high RR in HPM group had less motionartifact and better subjective score of image quality compared with the patients at high RR in LPM group （both P <0.05），while thepatients at low RR had no statistical diferences in motionartifact orsubjective score between HPMgroup and LPM group （both P>0.05 ） Conclusions：HPMcanbeusedtoevaluatethelungsof infantswith higherRR，andcanshowbeterimagequality.LPMcan beused forlungassessment of infantswith low RR，which canreduce radiationdoseand maintain good image quality. [Key words] High pitch mode;Low pitch mode;Infant;Radiation dosage;Tomopraghy，X-ray computed

胸部CT被用来评估多种婴幼儿疾病，但不能自主屏气患儿无法获得高质量的静止胸部CT图像。（剩余6720字）