宽体探测器CT在婴幼儿及儿童腹部检查中不同扫描模式对图像质量和辐射剂量的研究  

Investigation on image quality and radiation dose of different scanning modes of wide-body detector CT in abdominal examination of infants and children

作　　者：何朝梁 杨洁 但虹甫 袁超 何一丹 冯浩[1] He Chaoliang;Yang Jie;Dan Hongfu;Yuan Chao;He Yidan;Feng Hao(CT room,Department of Radiology,Zigong First People′s Hospital,Sichuan643000,China)

机构地区：[1]四川省自贡市第一人民医院放射科CT室,643000

出　　处：《实用医学影像杂志》2023年第4期253-256,共4页Journal of Practical Medical Imaging

摘　　要：目的探讨Revolution 16cm宽体探测器CT在婴幼儿及儿童腹部轴位扫描和螺旋扫描模式中图像质量和辐射剂量的影响。方法分析21例(1 d至10岁)腹部CT平扫检查且2个月内复查的患儿自身对照,根据就诊检查的先后分别行腹部轴位扫描(A组)和螺旋扫描(B组)。对A、B 2组图像进行主、客观评价,比较A组和B组图像主观评分、CT值(Hu)、噪声SD、信噪比(SNR)、对比噪声比(CNR)、容积剂量指数(CTDIvol)、剂量长度乘积(DLP)以及有效剂量(ED)。结果A、B 2组患儿图像的主观评分、CT值、噪声SD、SNR、CNR比较差异均无统计意义(P>0.05);CTDIvol、DLP和ED比较差异有统计学意义(P<0.05)。结论宽体探测器CT在婴幼儿及儿童腹部检查中采用轴位扫的扫描模式下保证图像质量的同时能有效降低患儿的有效辐射剂量。Objective To explore the effects of radiation dose and image quality of Revolution 16cm wide-body detector CT in children abdominal axial scan and helical scan mode.Methods A total of 21 infants and children(1 day to 10 years old)who were examined by abdominal CT plain scan and were reviewed within 2 months were analyzed.According to the order of examination,they underwent an abdominal axial scan(group A)and a helical scan(group B).Subjective and objective evaluations were performed on the images of the two groups of A and B,and the differences of subjective scores,CT value,noise SD,signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR),volume dose index(CTDIvol),dose length product(DLP)and effective dose(ED)between the two groups were compared.Results The subjective score,CT value,noise SD,SNR and CNR of the children in the two groups of A and B were not statistically significant(P>0.05).The differences of CTDIvol,DLP and ED between the two groups were statistically different(P<0.05).Conclusion Wide-body detector CT can reduce the effective radiation dose of children while ensuring the image quality in the scanning mode of axial scan in the abdominal examination of infants and children.

关 键 词：辐射剂量 放射摄影术 腹部 宽体探测器 婴幼儿 儿童 

分 类 号：R816.92[医药卫生—放射医学]