CAJ | 학술논문

目的探讨儿童髋关节CT检查时降低管电流对图像质量的影响.方法随机选儿童髋关节CT扫描45例,分常规剂量组、低剂量Ⅰ组(<6岁)和低剂量Ⅱ组(6～12岁).记录容积CT剂量指数(CTDIvol)和扫描长度,计算出平均剂量长度乘积(DLP).由专家对不同扫描参数的软组织窗和骨密度算法重建的骨窗图像质量分别进行评分,并进行统计学处理.结果常规剂量组、低剂量Ⅰ组和Ⅱ组的CTDLvol分别为35.4、15.8、17.3 mCy,DLP分别为(442.75±23.51)、(197.91±18.46)和(216.01±14.25)mCy·cm.各组可满足临床诊断要求的图像的比例差异无统计学意义(P>0.05).结论儿童髋关节CT检查时应采用低剂量扫描技术,既减少辐射剂量,又能保证图像质量,满足临床诊断的要求.
목적 탐토인동관관절CT검사시강저관전류대도상질량적영향.방법 수궤선인동관관절CT소묘45례,분상규제량조、저제량Ⅰ조(<6세)화저제량Ⅱ조(6～12세).기록용적CT제량지수(CTDIvol)화소묘장도,계산출평균제량장도승적(DLP).유전가대불동소묘삼수적연조직창화골밀도산법중건적골창도상질량분별진행평분,병진행통계학처리.결과 상규제량조、저제량Ⅰ조화Ⅱ조적CTDLvol분별위35.4、15.8、17.3 mCy,DLP분별위(442.75±23.51)、(197.91±18.46)화(216.01±14.25)mCy·cm.각조가만족림상진단요구적도상적비례차이무통계학의의(P>0.05).결론 인동관관절CT검사시응채용저제량소묘기술,기감소복사제량,우능보증도상질량,만족림상진단적요구.
Objective To discuss the effect of reducing the tube current on the images quality in undergoing hip joint CT examination for children. Methods Forty-five patients were divided at random into three groups with different tube currents, namely group with routine dose, group Ⅰ aged less than 6 years with low dose and group Ⅱ aged from 6 to 12 with low dose. CT dose index ( CTDLvol) and average dose-length produce (DLP) were detected. The image quality of three groups was analyzed by experienced ragiologists with score assessment and t-test. Results The CTDLvol values of three groups were 35.4,15.8 and 17.3 mGy, and those of DLP were 442.75±23.51,197.91±18.46 and 216.01±14.25 mGy·cm, respectively. The percentage of images meeting clinic diagnostic requirement was no significantly different (P>0.05) in three groups. Conclusion Low dose helix CT scan for children's hip joint can meet the clinic diagnostic requirement.