【摘要】 目的优化儿童腹部CT扫描参数,减少其辐射危害。方法在预扫描的基础上,将60只实验犬按脐平面腹围值分为4组,每组15只,根据成人腹部CT扫描常规剂量进行适当调整,分别以110、150、190和240mAs行腹部扫描,并评价其成像质量。然后将120例疑有腹部病变的患儿按腹围大小分为4组,参照实验犬腹部扫描参数行腹部CT扫描,最后分析其成像质量。结果实验犬和患儿扫描曝光量适当降低后,优良级片率分别为90·9%和92·0%,而曝光量及单一扫描层面的加权CT剂量指数值均降低到标准曝光量的45·8%~79·17%。结论依据儿童腹围大小适当降低腹部CT扫描曝光量可明显减少患儿的辐射剂量,有效地保护患儿。更多还原

【Abstract】 Objective To optimize the abdominal helical CT scanning parameters in pediatric patients and to reduce its radiation hazards. Methods 60 canines were evenly grouped into 4 groups on the basis of pediatric abdominal perimeter, scanned with 110,150,190 and 240 mAs, and their qualities of canine CT images were analyzed. 120 pediafric patients with clinic suspected abdominal diseases were divided into 4 groups on the basis of abdominal perimeter,scanned by optimal parameters and their image qualities were analyzed. Results After CT exposure were reduced, the percentages of total A and B were 90.9% and 92.0% in experimental canines and in pediatric patients, respectively. Compared with conventional CT scanning,the exposure and single slice CT dose index weighted(CTDIw) were reduced to 45.8%-79.17%. Conclusion By adjusted the pediatric helical CT parameters basedon the of pediatric abdominal perimeter,exposure of patient to the hazards of radiation is reduced.;更多还原