儿童鼻窦低剂量CT成像

The Sinus Image of Reduction Dose in Children with Spiral CT

目的:在保证图像质量的前提下,确定儿童鼻窦CT成像最佳低管电流,减少X线辐射剂量。材料与方法:80例进行鼻窦成像的儿童随机分为4组,成像管电压为120kV,标准组管电流350mA,低剂量组管电流分别为235mA、175mA和125mA。将各低剂量组所获得的图像进行比较,计算DLP和ED平均值及各组ED减少的百分比。结果:与标准剂量组比较,各低剂量组鼻窦结构清晰,图像质量与标准剂量组无明显差别,能够满足临床诊断需要,同时各低剂量组ED比标准组分别降低了23.9%、42.7%和60.2%。结论:应用125mA低管电流,可获得临床诊断需要的儿童鼻窦图像,且ED剂量显著降低。

Objective： To reduce radiation dose and ensure sinus image quality in children with optimizing tube current. Materials and Methods： 80 children were randomly divided into standard dose group and three low dose groups, in which tube voltage was constantly 120kV and tube current were 350mA, 235mA, 175mA, and125mA, respectively. The mean DLP and ED of each group were measured, compared with mean ED in standard dose group, and then decrease of ED in three low dose groups were calculated separately. The image quality in all groups was blindly evaluated. Results： Compared with standard dose group, ED of other three groups decreased by 23.9%, 42.7%, and 60.2%, respectively. For image quality in all groups, there were no differences found. All sinus images reached desired diagnostic quality. Conclusion： With reduced tube current of 125mA, low dose CT of sinuses in children can yield diagnostic image quality; further radiation dose are reduced about 60%.