摘要
目的:研究基于体重指数调整的儿童上腹部低剂量CT扫描方案的辐射剂量、主客观图像质量和诊断准确性。方法:对比分析不同体重指数儿童上腹部低剂量CT扫描中的差异,前瞻性分析50%自适应统计迭代重建(adaptive statistical iterative reconstruction,ASIR)常规剂量和基于体重指数调整的上腹部低剂量CT扫描方案检查,年龄1个月~14岁。使用五点量表主观评估包括噪音,清晰度,伪影和诊断可接受性在内的图像质量。结果:3名医师对图像质量主观评分的一致性大,差异无统计学意义(κ=0.76,P>0.01)。各组肝实质CT值比较差异无统计学意义(P>0.01);各组间SNR比较差异有统计学意义(P<0.01),图像质量均可接受。基于体重指数调整的上腹部B组所有辐射剂量参数均显著较低(P<0.01),其中A组正常高于B组正常,差异有统计学意义(P<0.01),后者剂量减少32.5%;A组超重高于B组超重,差异有统计学意义(P<0.01),后者剂量减少40.4%。结论:在正常体重和超重儿童中,50%ASIR重建的个性化低剂量CT扫描方案平均剂量明显低于常规剂量,而不会显著影响儿童上腹部CT检查的诊断图像质量。
Objective:To evaluate the feasibility of the radiation dose,subjective and objective image quality and diagnostic accuracy of the low-dose CT scanning scheme for the upper abdomen of children based on BMI adjustment.Method:The differences in low-dose CT scans of the upper abdomen of children with different BMI were compared,and the 50%routine adaptive statistical iterative reconstruction(ASIR)and low-dose CT scan protocol based on BMI were prospectively analyzed,ranging in age from 1 month to 14 years old.A five-point scale was used to evaluate the subjective image quality including noise,sharpness,artifact,and diagnostic acceptability.Result:Inter-observer agreement among the three radiologists was sufficient,no significant statistical difference was existed among each group(κ=0.76,P>0.01).There was no significant difference of CT values of liver parenchyma among each groups(P>0.01).The differences of SNR among each groups were statistically significant(P<0.01).The image quality in each group were acceptable.All radiation dose parameters were significantly reduced in the group B based on BMI(P<0.01).Normal weight in group A was higher than that in group B,and the differences between two groups were statistically significant(P<0.01);and the dose of the normal weight children in group B was reduced by 32.5%.Overweight in group A was higher than that in group B,and the differences between two groups were statistically significant(P<0.01),and the dose of the overweight children in group B was reduced by 40.4%.Conclusion:In normal weight and overweight children,50%of the personalized low-dose CT scan regimen with ASIR reconstruction was significantly lower than the routine dose,without significantly affecting the diagnostic image quality of the upper abdominal CT examination in children.
作者
陈添峰
周文斌
吴素霞
王强
CHEN Tianfeng;ZHOU Wenbin;WU Suxia;WANG Qiang(Women’s and Children’s Hospital,Quanzhou 362000,China)
出处
《中外医学研究》
2020年第1期51-53,共3页
CHINESE AND FOREIGN MEDICAL RESEARCH
基金
泉州市科技计划项目(项目编号:2016Z039)
关键词
儿童
CT
辐射剂量
Children
Computed tomography
Radiation dose